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Full vulnerability report · 2026
CVE-2026-65927High confidence

Apache Tomcat: RewriteValve [N] restarts at the second rule and may bypass access control

Apache Software Foundation · Apache Tomcat

7.5HighCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 5 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • The selected CVSS metric records a network-reachable, unauthenticated path with no user interaction.
  • EPSS is 0.68% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict the affected network interface to trusted sources where business-safe.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs Apache Software Foundation Apache Tomcat and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Cross-source reconciliation

Remediation availability differs by product scope

Verified remediation exists for at least one product or source, but 5 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Distribution package intelligence

Release-specific package status

Debian, ubuntu findings are scoped to the named distribution, release and source package. An absent finding does not mean a package is unaffected.

13 package states
Package result overrides the generic status

BlackTree has verified remediation for at least one product or source, but the relevant distribution still reports no fixed package for 5 affected package states shown here. Treat those rows as affected with no fix until that distribution publishes a fixed version.

Repository candidate not checked

A published vendor fix does not prove that a matching update is enabled and installable on a particular asset. Confirm the local package candidate before scheduling remediation.

Distribution releaseSource packageVendor stateFixed versionEvidence
Debian trixietrixie · sourcetomcat10Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian trixietrixie · sourcetomcat11Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian trixietrixie · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcetomcat10Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian bookwormbookworm · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcetomcat10Vendor fix publishedDebian records a fixed source-package version for this release.10.1.60-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcetomcat11Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian forkyforky · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcetomcat10Vendor fix publishedDebian records a fixed source-package version for this release.10.1.60-1Debian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcetomcat11Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 6 Oct 2026
Debian sidsid · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 6 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appstomcat10Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · esm-appstomcat9Under evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 5 Oct 2026
Direct vendor intelligence

Authoritative vendor CSAF and VEX advisories

Structured product status and remediation from the issuing vendor. Product-state explanations are always visible; large lists can be searched or downloaded.

1 current
CVE-2026-65927 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitytomcat: Apache Tomcat: Access control bypass due to off-by-one error in RewriteValve [N] flag processing
66 known affected

The vendor explicitly identifies these products as affected by this CVE.

  • tomcat as a component of Red Hat Enterprise Linux 10
  • tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10
  • tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10
  • tomcat-el-5.0-api as a component of Red Hat Enterprise Linux 10
  • tomcat-jsp-3.1-api as a component of Red Hat Enterprise Linux 10
  • tomcat-lib as a component of Red Hat Enterprise Linux 10
  • tomcat-servlet-6.0-api as a component of Red Hat Enterprise Linux 10
  • tomcat-webapps as a component of Red Hat Enterprise Linux 10
  • tomcat.src as a component of Red Hat Enterprise Linux 10
  • tomcat9 as a component of Red Hat Enterprise Linux 10
  • tomcat9-admin-webapps as a component of Red Hat Enterprise Linux 10
  • tomcat9-docs-webapp as a component of Red Hat Enterprise Linux 10
Summary
A flaw was found in Apache Tomcat. An off-by-one error in the RewriteValve's [N] flag processing causes rewrite rules to restart at the second rule instead of the first. This vulnerability may allow an attacker to bypass intended access controls.
Remediation
Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2026-66130

No EUVD known-exploited evidence

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
7.5 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

High technical severity; prioritise exposed affected systems while verifying vendor guidance. Verified remediation exists for at least one product or source, but 5 structured product or package states remain unresolved. Apply remediation only to the exact product branch confirmed by its source.

Fix availability varies by product
01

What, why and how

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

What

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

Why

A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

Why

A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
a network path → Off-by-one Error → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Network
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Unchanged: impact remains within the vulnerable component's security authority
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-193 ↗

CWE-193: Off-by-one Error. A product calculates or uses an incorrect maximum or minimum value that is 1 more, or 1 less, than the correct value.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Common Vulnerability Scoring System 3.1: the compact vector below is decoded into plain language.

AVNetworkAttack vector: The vulnerable component can be reached over a network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.SUnchangedScope: The security impact remains within the vulnerable component's authority.CNoneConfidentiality impact: No direct loss is represented by this metric.INoneIntegrity impact: No direct loss is represented by this metric.AHighAvailability impact: A successful attack can cause a major loss.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
NetworkUnauthenticatedCWE-193
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

ENISA EUVD · EUVD-2026-66130Official EUVD mapping

Off-by-one Error vulnerability in Apache Tomcat impacting the [N] flag on the rewrite valves causes rewrite processing to restart at the second rule rather than the first rule. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.24, from 10.1.0-M1 through 10.1.57, from 9.0.0.M1 through 9.0.120. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.0 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.25, 10.1.58 or 9.0.121 which fix the issue.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3595IBM QRadar SIEM: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in IBM QRadar SIEM ausnutzen, um beliebigen Programmcode auszuführen, um seine Privilegien zu erhöhen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Dateien zu manipulieren, um einen Cross-Site Scripting Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
BSI · German · WID-SEC-2026-3007Apache Tomcat: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Berechtigungen zu erweitern, Daten zu manipulieren oder offenzulegen oder Denial-of-Service-Zustände zu verursachen.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1249Multiples vulnérabilités dans les produits VMware

ERecord?id=CVE-2026-63388 Référence CVE CVE-2026-6357 https://www.cve.org/CVERecord?id=CVE-2026-6357 Référence CVE CVE-2026-6368 https://www.cve.org/CVERecord?id=CVE-2026-6368 Référence CVE CVE-2026-6477 https://www.cve.org/CVERecord?id=CVE-2026-6477 Référence CVE CVE-2026-64847 https://www.cve.org/CVERecord?id=CVE-2026-64847 Référence CVE CVE-2026-65182 https://www.cve.org/CVERecord?id=CVE-2026-65182 Référence CVE CVE-2026-65183 https://www.cve.org/CVERecord?id=CVE-2026-65183 Référence CVE CVE-2026-65637 https://www.cve.org/CVERecord?id=CVE-2026-65637 Référence CVE CVE-2026-65905 https://www.cve.org/CVERecord?id=CVE-2026-65905 Référence CVE CVE-2026-65927 https://www.cve.org/CVERecord?id=CVE-2026-65927 Référence CVE CVE-2026-66299 https://www.cve.org/CVERecord?id=CVE-2026-66299 Référence CVE CVE-2026-66422 https://www.cve.org/CVERecord?id=CVE-2026-66422 Référence CVE CVE-2026-6653 https://www.cve.org/CVERecord?id=CVE-2026-6653 Référence CVE CVE-2026-6791 https://www.cve.org/CVERecord?id=CVE-2026-6791 Référence CVE CVE-2026-68497 https://www.cve.org/CVERecord?id=CVE-2026-68497 Référence CVE CVE-2026-68525 https://www.cve.org/CVERecord?id=CVE-2026-68525 Référence CVE CVE-2026-68569 https://www.cve.org/CVERecord?id=CVE-2026-68569 Référence CVE CVE-2026-68763 https://www.cve.org/CVERecord?id=CVE-

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1256Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-65901 Référence CVE CVE-2026-65902 https://www.cve.org/CVERecord?id=CVE-2026-65902 Référence CVE CVE-2026-65903 https://www.cve.org/CVERecord?id=CVE-2026-65903 Référence CVE CVE-2026-65904 https://www.cve.org/CVERecord?id=CVE-2026-65904 Référence CVE CVE-2026-65905 https://www.cve.org/CVERecord?id=CVE-2026-65905 Référence CVE CVE-2026-65911 https://www.cve.org/CVERecord?id=CVE-2026-65911 Référence CVE CVE-2026-65912 https://www.cve.org/CVERecord?id=CVE-2026-65912 Référence CVE CVE-2026-65913 https://www.cve.org/CVERecord?id=CVE-2026-65913 Référence CVE CVE-2026-65914 https://www.cve.org/CVERecord?id=CVE-2026-65914 Référence CVE CVE-2026-65927 https://www.cve.org/CVERecord?id=CVE-2026-65927 Référence CVE CVE-2026-66010 https://www.cve.org/CVERecord?id=CVE-2026-66010 Référence CVE CVE-2026-66422 https://www.cve.org/CVERecord?id=CVE-2026-66422 Référence CVE CVE-2026-67213 https://www.cve.org/CVERecord?id=CVE-2026-67213 Référence CVE CVE-2026-67214 https://www.cve.org/CVERecord?id=CVE-2026-67214 Référence CVE CVE-2026-67312 https://www.cve.org/CVERecord?id=CVE-2026-67312 Référence CVE CVE-2026-67313 https://www.cve.org/CVERecord?id=CVE-2026-67313 Référence CVE CVE-2026-67314 https://www.cve.org/CVERecord?id=CVE-2026-67314 Référence CVE CVE-2026-67315 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1165Multiples vulnérabilités dans les produits IBM

d?id=CVE-2026-65898 Référence CVE CVE-2026-65899 https://www.cve.org/CVERecord?id=CVE-2026-65899 Référence CVE CVE-2026-65900 https://www.cve.org/CVERecord?id=CVE-2026-65900 Référence CVE CVE-2026-65901 https://www.cve.org/CVERecord?id=CVE-2026-65901 Référence CVE CVE-2026-65902 https://www.cve.org/CVERecord?id=CVE-2026-65902 Référence CVE CVE-2026-65903 https://www.cve.org/CVERecord?id=CVE-2026-65903 Référence CVE CVE-2026-65904 https://www.cve.org/CVERecord?id=CVE-2026-65904 Référence CVE CVE-2026-65905 https://www.cve.org/CVERecord?id=CVE-2026-65905 Référence CVE CVE-2026-65911 https://www.cve.org/CVERecord?id=CVE-2026-65911 Référence CVE CVE-2026-65927 https://www.cve.org/CVERecord?id=CVE-2026-65927 Référence CVE CVE-2026-66010 https://www.cve.org/CVERecord?id=CVE-2026-66010 Référence CVE CVE-2026-66142 https://www.cve.org/CVERecord?id=CVE-2026-66142 Référence CVE CVE-2026-66143 https://www.cve.org/CVERecord?id=CVE-2026-66143 Référence CVE CVE-2026-66144 https://www.cve.org/CVERecord?id=CVE-2026-66144 Référence CVE CVE-2026-66422 https://www.cve.org/CVERecord?id=CVE-2026-66422 Référence CVE CVE-2026-67213 https://www.cve.org/CVERecord?id=CVE-2026-67213 Référence CVE CVE-2026-67214 https://www.cve.org/CVERecord?id=CVE-2026-67214 Référence CVE CVE-2026-67312 https://www.cve.org/CVERecord?id=

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1083Multiples vulnérabilités dans Apache Tomcat

De multiples vulnérabilités ont été découvertes dans Apache Tomcat. Elles permettent à un attaquant de provoquer un déni de service à distance et un contournement de la politique de sécurité.

Official advisory ↗
CSIRT Italia · Italian · risolte-vulnerabilita-in-prodotti-apache-4Risolte vulnerabilità in prodotti Apache

Rilevate 10 vulnerabilità di sicurezza in prodotti Apache, di cui 7 con gravità "critica" e 3 con gravità "alta". Tali vulnerabilità, qualora sfruttate, potrebbero consentire a un utente malintenzionato di eludere i meccanismi di autenticazione e di sicurezza sui sistemi interessati.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-030392Apache Tomcatにおける複数の脆弱性(2026年8月25日)

The Apache Software Foundationから、Apache Tomcatの10件の脆弱性に対してアドバイザリが公開されました。 Fixed in Apache Tomcat 11.0.25 Fixed in Apache Tomcat 10.1.59 Fixed in Apache Tomcat 9.0.121

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6935Apache 제품 보안 업데이트 권고

Apache Tomcat에서 발생하는 Off-by-one Error 취약점(CVE-2026-65927) [9][19]

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Fix availability varies by product
Affected
Fixed
Action
Use the product-specific evidence above. Patch only products with a verified fixed release, and keep every affected or under-investigation state without a matching fix in the remediation queue.
Workaround
No verified workaround is recorded. If business-safe, reduce exposure to the affected interface and allow only trusted sources until authoritative guidance is available.
04

Evidence and provenance

Published 25 Aug 2026 · Last source change 26 Aug 2026, 15:22 UTC · CWE-193 · Off-by-one Error

CVE recordCVE.org · 5.2
CVSS sourceCISA ADP
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-26
European sourceENISA EUVD · EUVD-2026-66130
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗
  1. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-65927 to remediation: access.redhat.com/CVE-2026-65927.
    Before
    remediation: access.redhat.com/CVE-2026-65927
    After
    remediation: access.redhat.com/CVE-2026-65927
    Red Hat Product Security ↗
  2. Affected versionsThe structured affected or fixed version information changed.
    Before
    tomcat as a component of Red Hat Enterprise Linux 10; tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat-el-5.0-api as a component of Red Hat Enterprise Linux 10; tomcat-jsp-3.1-api as a component of Red Hat Enterprise Linux 10; tomcat-lib as a component of Red Hat Enterprise Linux 10; tomcat-servlet-6.0-api as a component of Red Hat Enterprise Linux 10; tomcat-webapps as a component of Red Hat Enterprise Linux 10; tomcat.src as a component of Red Hat Enterprise Linux 10; tomcat9 as a component of Red Hat Enterprise Linux 10; tomcat9-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat9-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat9-el-3.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-jsp-2.3-api as a component of Red Hat Enterprise Linux 10; tomcat9-lib as a component of Red Hat Enterprise Linux 10; tomcat9-servlet-4.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-webapps as a component of Red Hat Enterprise Linux 10; tomcat9.src as a component of Red Hat Enterprise Linux 10; tomcat6 as a component of Red Hat Enterprise Linux 6; tomcat6-admin-webapps as a component of Red Hat Enterprise Linux 6; tomcat6-docs-webapp as a component of Red Hat Enterprise Linux 6; tomcat6-el-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-javadoc as a component of Red Hat Enterprise Linux 6; tomcat6-jsp-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-lib as a component of Red Hat Enterprise Linux 6; tomcat6-log4j as a component of Red Hat Enterprise Linux 6; tomcat6-servlet-2.5-api as a component of Red Hat Enterprise Linux 6; tomcat6-webapps as a component of Red Hat Enterprise Linux 6; tomcat6.src as a component of Red Hat Enterprise Linux 6; tomcat as a component of Red Hat Enterprise Linux 7; and 36 more · Fixed: tomcat10-0:10.1.59-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat10-0:10.1.59-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@src as a component of Red Hat Hardened Images; Red Hat JBoss Web Server 6.2.5
    After
    tomcat as a component of Red Hat Enterprise Linux 10; tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat-el-5.0-api as a component of Red Hat Enterprise Linux 10; tomcat-jsp-3.1-api as a component of Red Hat Enterprise Linux 10; tomcat-lib as a component of Red Hat Enterprise Linux 10; tomcat-servlet-6.0-api as a component of Red Hat Enterprise Linux 10; tomcat-webapps as a component of Red Hat Enterprise Linux 10; tomcat.src as a component of Red Hat Enterprise Linux 10; tomcat9 as a component of Red Hat Enterprise Linux 10; tomcat9-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat9-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat9-el-3.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-jsp-2.3-api as a component of Red Hat Enterprise Linux 10; tomcat9-lib as a component of Red Hat Enterprise Linux 10; tomcat9-servlet-4.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-webapps as a component of Red Hat Enterprise Linux 10; tomcat9.src as a component of Red Hat Enterprise Linux 10; tomcat6 as a component of Red Hat Enterprise Linux 6; tomcat6-admin-webapps as a component of Red Hat Enterprise Linux 6; tomcat6-docs-webapp as a component of Red Hat Enterprise Linux 6; tomcat6-el-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-javadoc as a component of Red Hat Enterprise Linux 6; tomcat6-jsp-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-lib as a component of Red Hat Enterprise Linux 6; tomcat6-log4j as a component of Red Hat Enterprise Linux 6; tomcat6-servlet-2.5-api as a component of Red Hat Enterprise Linux 6; tomcat6-webapps as a component of Red Hat Enterprise Linux 6; tomcat6.src as a component of Red Hat Enterprise Linux 6; tomcat as a component of Red Hat Enterprise Linux 7; and 36 more · Fixed: jws6-tomcat-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-0:10.1.49-16.redhat_00016.1.el10jws.src as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-admin-webapps-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-docs-webapp-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-el-5.0-api-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-javadoc-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-jsp-3.1-api-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-lib-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-selinux-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-servlet-6.0-api-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-webapps-0:10.1.49-16.redhat_00016.1.el10jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 10; jws6-tomcat-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-0:10.1.49-16.redhat_00016.1.el8jws.src as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-admin-webapps-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-docs-webapp-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-el-5.0-api-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-javadoc-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-jsp-3.1-api-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-lib-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-selinux-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-servlet-6.0-api-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-webapps-0:10.1.49-16.redhat_00016.1.el8jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 8; jws6-tomcat-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-0:10.1.49-16.redhat_00016.1.el9jws.src as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-admin-webapps-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-docs-webapp-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-el-5.0-api-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-javadoc-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-jsp-3.1-api-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; jws6-tomcat-lib-0:10.1.49-16.redhat_00016.1.el9jws.noarch as a component of Red Hat JBoss Web Server 6.2 on RHEL 9; and 8 more
    Red Hat Product Security ↗
  3. Affected versionsThe structured affected or fixed version information changed.
    Before
    tomcat as a component of Red Hat Enterprise Linux 10; tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat-el-5.0-api as a component of Red Hat Enterprise Linux 10; tomcat-jsp-3.1-api as a component of Red Hat Enterprise Linux 10; tomcat-lib as a component of Red Hat Enterprise Linux 10; tomcat-servlet-6.0-api as a component of Red Hat Enterprise Linux 10; tomcat-webapps as a component of Red Hat Enterprise Linux 10; tomcat.src as a component of Red Hat Enterprise Linux 10; tomcat9 as a component of Red Hat Enterprise Linux 10; tomcat9-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat9-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat9-el-3.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-jsp-2.3-api as a component of Red Hat Enterprise Linux 10; tomcat9-lib as a component of Red Hat Enterprise Linux 10; tomcat9-servlet-4.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-webapps as a component of Red Hat Enterprise Linux 10; tomcat9.src as a component of Red Hat Enterprise Linux 10; tomcat6 as a component of Red Hat Enterprise Linux 6; tomcat6-admin-webapps as a component of Red Hat Enterprise Linux 6; tomcat6-docs-webapp as a component of Red Hat Enterprise Linux 6; tomcat6-el-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-javadoc as a component of Red Hat Enterprise Linux 6; tomcat6-jsp-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-lib as a component of Red Hat Enterprise Linux 6; tomcat6-log4j as a component of Red Hat Enterprise Linux 6; tomcat6-servlet-2.5-api as a component of Red Hat Enterprise Linux 6; tomcat6-webapps as a component of Red Hat Enterprise Linux 6; tomcat6.src as a component of Red Hat Enterprise Linux 6; tomcat as a component of Red Hat Enterprise Linux 7; and 37 more · Fixed: tomcat10-0:10.1.59-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat10-0:10.1.59-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@src as a component of Red Hat Hardened Images
    After
    tomcat as a component of Red Hat Enterprise Linux 10; tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat-el-5.0-api as a component of Red Hat Enterprise Linux 10; tomcat-jsp-3.1-api as a component of Red Hat Enterprise Linux 10; tomcat-lib as a component of Red Hat Enterprise Linux 10; tomcat-servlet-6.0-api as a component of Red Hat Enterprise Linux 10; tomcat-webapps as a component of Red Hat Enterprise Linux 10; tomcat.src as a component of Red Hat Enterprise Linux 10; tomcat9 as a component of Red Hat Enterprise Linux 10; tomcat9-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat9-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat9-el-3.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-jsp-2.3-api as a component of Red Hat Enterprise Linux 10; tomcat9-lib as a component of Red Hat Enterprise Linux 10; tomcat9-servlet-4.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-webapps as a component of Red Hat Enterprise Linux 10; tomcat9.src as a component of Red Hat Enterprise Linux 10; tomcat6 as a component of Red Hat Enterprise Linux 6; tomcat6-admin-webapps as a component of Red Hat Enterprise Linux 6; tomcat6-docs-webapp as a component of Red Hat Enterprise Linux 6; tomcat6-el-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-javadoc as a component of Red Hat Enterprise Linux 6; tomcat6-jsp-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-lib as a component of Red Hat Enterprise Linux 6; tomcat6-log4j as a component of Red Hat Enterprise Linux 6; tomcat6-servlet-2.5-api as a component of Red Hat Enterprise Linux 6; tomcat6-webapps as a component of Red Hat Enterprise Linux 6; tomcat6.src as a component of Red Hat Enterprise Linux 6; tomcat as a component of Red Hat Enterprise Linux 7; and 36 more · Fixed: tomcat10-0:10.1.59-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat10-0:10.1.59-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@src as a component of Red Hat Hardened Images; Red Hat JBoss Web Server 6.2.5
    Red Hat Product Security ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    tomcat as a component of Red Hat JBoss Web Server 5; tomcat as a component of Red Hat JBoss Web Server 6; tomcat as a component of Red Hat JBoss Web Server 7 · Fixed: tomcat10-main@noarch as a component of Red Hat Hardened Images; tomcat10-main@src as a component of Red Hat Hardened Images; tomcat11-main@noarch as a component of Red Hat Hardened Images; tomcat11-main@src as a component of Red Hat Hardened Images
    After
    tomcat as a component of Red Hat Enterprise Linux 10; tomcat-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat-el-5.0-api as a component of Red Hat Enterprise Linux 10; tomcat-jsp-3.1-api as a component of Red Hat Enterprise Linux 10; tomcat-lib as a component of Red Hat Enterprise Linux 10; tomcat-servlet-6.0-api as a component of Red Hat Enterprise Linux 10; tomcat-webapps as a component of Red Hat Enterprise Linux 10; tomcat.src as a component of Red Hat Enterprise Linux 10; tomcat9 as a component of Red Hat Enterprise Linux 10; tomcat9-admin-webapps as a component of Red Hat Enterprise Linux 10; tomcat9-docs-webapp as a component of Red Hat Enterprise Linux 10; tomcat9-el-3.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-jsp-2.3-api as a component of Red Hat Enterprise Linux 10; tomcat9-lib as a component of Red Hat Enterprise Linux 10; tomcat9-servlet-4.0-api as a component of Red Hat Enterprise Linux 10; tomcat9-webapps as a component of Red Hat Enterprise Linux 10; tomcat9.src as a component of Red Hat Enterprise Linux 10; tomcat6 as a component of Red Hat Enterprise Linux 6; tomcat6-admin-webapps as a component of Red Hat Enterprise Linux 6; tomcat6-docs-webapp as a component of Red Hat Enterprise Linux 6; tomcat6-el-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-javadoc as a component of Red Hat Enterprise Linux 6; tomcat6-jsp-2.1-api as a component of Red Hat Enterprise Linux 6; tomcat6-lib as a component of Red Hat Enterprise Linux 6; tomcat6-log4j as a component of Red Hat Enterprise Linux 6; tomcat6-servlet-2.5-api as a component of Red Hat Enterprise Linux 6; tomcat6-webapps as a component of Red Hat Enterprise Linux 6; tomcat6.src as a component of Red Hat Enterprise Linux 6; tomcat as a component of Red Hat Enterprise Linux 7; and 37 more · Fixed: tomcat10-0:10.1.59-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat10-0:10.1.59-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@noarch as a component of Red Hat Hardened Images; tomcat11-0:11.0.25-0.1.hum1@src as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  5. Vendor guidanceAuthoritative vendor guidance changed from remediation: access.redhat.com/CVE-2026-65927 to remediation: access.redhat.com/CVE-2026-65927.
    Before
    remediation: access.redhat.com/CVE-2026-65927
    After
    remediation: access.redhat.com/CVE-2026-65927
    Red Hat Product Security ↗
  6. Remediation statusRemediation status changed from Mitigation available to Patch available.
    Before
    Mitigation available
    After
    Patch available
    Red Hat Product Security ↗
  7. Affected versionsThe structured affected or fixed version information changed.
    Before
    tomcat10.src as a component of Red Hat Hardened Images; tomcat11.src as a component of Red Hat Hardened Images; tomcat as a component of Red Hat JBoss Web Server 5; tomcat as a component of Red Hat JBoss Web Server 6; tomcat as a component of Red Hat JBoss Web Server 7
    After
    tomcat as a component of Red Hat JBoss Web Server 5; tomcat as a component of Red Hat JBoss Web Server 6; tomcat as a component of Red Hat JBoss Web Server 7 · Fixed: tomcat10-main@noarch as a component of Red Hat Hardened Images; tomcat10-main@src as a component of Red Hat Hardened Images; tomcat11-main@noarch as a component of Red Hat Hardened Images; tomcat11-main@src as a component of Red Hat Hardened Images
    Red Hat Product Security ↗
  8. Affected versionsThe structured affected or fixed version information changed.
    Before
    tomcat as a component of Red Hat JBoss Web Server 5; tomcat as a component of Red Hat JBoss Web Server 6; tomcat as a component of Red Hat JBoss Web Server 7
    After
    tomcat10.src as a component of Red Hat Hardened Images; tomcat11.src as a component of Red Hat Hardened Images; tomcat as a component of Red Hat JBoss Web Server 5; tomcat as a component of Red Hat JBoss Web Server 6; tomcat as a component of Red Hat JBoss Web Server 7
    Red Hat Product Security ↗
  9. Vendor guidanceAuthoritative vendor guidance changed: added vendor advisory: lists.apache.org/st1dx1zyn5y7ny2s0sscmh6lrv3worr4.
    Before
    remediation: lists.apache.org/st1dx1zyn5y7ny2s0sscmh6lrv3worr4
    After
    remediation: lists.apache.org/st1dx1zyn5y7ny2s0sscmh6lrv3worr4 · vendor advisory: lists.apache.org/st1dx1zyn5y7ny2s0sscmh6lrv3worr4
    security@apache.org ↗
  10. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    CISA ADP ↗
  11. CVSS scoreCVSS score changed from not recorded to 7.5 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
    Before
    not recorded
    After
    7.5 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
    CISA ADP ↗
  12. ENISA EUVD mappingEUVD-2026-66130 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-66130"}
    ENISA EUVD ↗
  13. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Fixed release or patch reference recorded
ENISA EUVD · EUVD-2026-66130↗Vendor CSAF · Red Hat Product Security↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2026-65927 · cve.blacktree.nl