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Full vulnerability report · 2026
CVE-2026-77756High confidence

Apache Tomcat: Transfer-Encoding honored for HTTP/1.0 requests

Apache Software Foundation · Apache Tomcat

3.7LowCVSS 3.1
Recommended action
Patch only the product branches with a verified fix

Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 473 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 severityLowOperational priority:Low, 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 0.26% 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: No default targetRemediation target: Normal maintenance

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 473 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 5 Oct 2026
Debian trixietrixie · sourcetomcat11Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian trixietrixie · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcetomcat10Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcetomcat10Vendor fix publishedDebian records a fixed source-package version for this release.10.1.60-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcetomcat11Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcetomcat10Vendor fix publishedDebian records a fixed source-package version for this release.10.1.60-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcetomcat11Affected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcetomcat9Vendor fix publishedDebian records a fixed source-package version for this release.9.0.70-2Debian Security Tracker ↗Source updated 5 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.

2 current
CVE-2026-77756 · CSAF 2.0 · revision 3 · finalRed Hat Product Securitytomcat: Apache Tomcat: Request smuggling vulnerability can lead to denial of service
87 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. This vulnerability, known as HTTP Request/Response Smuggling, occurs when Tomcat processes the transfer-encoding header for an HTTP/1.0 request while operating behind a reverse proxy. A remote attacker could exploit this to cause a denial of service, leading to one user's request failing due to interference from another user's request.
Remediation
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/
CVE-2026-77756 · CSAF 2.0 · revision 2 · interimSUSE Product Security TeamCVE-2026-77756
468 known affected

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

  • tomcat as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-admin-webapps as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-docs-webapp as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-el-3_0-api as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-javadoc as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-jsp-2_3-api as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-lib as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-servlet-4_0-api as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat-webapps as component of SUSE Linux Enterprise High Performance Computing 12 SP5
  • tomcat as component of SUSE Linux Enterprise High Performance Computing 15 SP2
  • tomcat-admin-webapps as component of SUSE Linux Enterprise High Performance Computing 15 SP2
  • tomcat-el-3_0-api as component of SUSE Linux Enterprise High Performance Computing 15 SP2
Summary
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.
Remediation
No remediation text is recorded.
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-2026-85226

No EUVD known-exploited evidence

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, 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
3.7 · CVSS 3.1
Advisory evidence
No linked advisory details stored yet
Recommended actionPatch only the product branches with a verified fix

Low technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority. Verified remediation exists for at least one product or source, but 473 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

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

What

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Why

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Why

The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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 → Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') → 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
High: exploitation depends on specific conditions
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-444 ↗

CWE-444: Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling'). The product acts as an intermediary HTTP agent (such as a proxy or firewall) in the data flow between two entities such as a client and server, but it does not interpret malformed HTTP requests or responses in ways that are consistent with how the messages will be processed by those entities that are at the ultimate destination.

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:H/PR:N/UI:N/S:U/C:N/I:N/A:L

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.ACHighAttack complexity: Successful exploitation depends on specific conditions outside the attacker's direct control.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.ALowAvailability impact: A successful attack can cause a limited 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-444
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-85226Official EUVD mapping

Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling') vulnerability in Apache Tomcat caused by processing the transfer-encoding header for an HTTP/1.0 request may allow an attacker to cause one request from another user to fail when Tomcat is located behind a reverse proxy. This issue affects Apache Tomcat: from 11.0.0-M1 through 11.0.25, from 10.1.0-M1 through 10.1.59, from 9.0.47 through 9.0.121. The following versions were EOL at the time the CVE was created but are known to be affected: from 8.5.67 through 8.5.100. Other unsupported versions may also be affected. Users are recommended to upgrade to version 11.0.26, 10.1.60 or 9.0.122, which fix the issue.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3527Apache Tomcat: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat ausnutzen, um Sicherheitsvorkehrungen zu umgehen, um einen Denial of Service Angriff durchzuführen und um Daten zu manipulieren.

Official advisory ↗
CERT-FR · French · CERTFR-2026-AVI-1218Multiples vulnérabilités dans Apache Tomcat

De multiples vulnérabilités ont été découvertes dans Apache Tomcat. Certaines d'entre elles permettent à un attaquant de provoquer un déni de service à distance, une atteinte à l'intégrité des données et un contournement de la politique de sécurité.

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 23 Sept 2026 · Last source change 23 Sept 2026, 18:10 UTC · CWE-444 · Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')

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 2026-09-24
European sourceENISA EUVD · EUVD-2026-85226
Product sourceVendor CSAF · Red Hat Product Security
Remediation sourceVendor CSAF · Red Hat Product Security
CWE sourceCNA
NVD statusNVD awaiting enrichment

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

Material change intelligence

What changed after publication

View recent updates ↗
  1. Affected versionsThe structured affected or fixed version information changed.
    Before
    Fixed: tomcat10-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-0:10.1.60-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat10-admin-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-admin-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-common-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-common-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-docs-webapp-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-docs-webapp-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-el-5.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-el-5.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-jsp-3.1-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-jsp-3.1-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-lib-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-lib-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-servlet-6.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-servlet-6.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-user-instance-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-user-instance-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-0:11.0.26-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat11-admin-webapps-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-admin-webapps-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-common-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-common-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-docs-webapp-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-docs-webapp-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; and 12 more
    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 57 more · Fixed: tomcat10-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-0:10.1.60-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat10-admin-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-admin-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-common-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-common-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-docs-webapp-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-docs-webapp-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-el-5.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-el-5.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-jsp-3.1-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-jsp-3.1-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-lib-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-lib-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-servlet-6.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-servlet-6.0-api-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-user-instance-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-user-instance-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat10-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat10-webapps-0:10.1.60-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-0:11.0.26-0.1.hum1@src as a component of Red Hat Hardened Images; tomcat11-admin-webapps-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-admin-webapps-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-common-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-common-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; tomcat11-docs-webapp-0:11.0.26-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images; tomcat11-docs-webapp-0:11.0.26-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images; and 12 more
    Red Hat Product Security ↗
  2. ENISA EUVD mappingEUVD-2026-85226 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-85226"}
    ENISA EUVD ↗
  3. SeveritySeverity changed from Unknown to Low.
    Before
    Unknown
    After
    Low
    CISA ADP ↗
  4. CVSS scoreCVSS score changed from not recorded to 3.7 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L).
    Before
    not recorded
    After
    3.7 (CVSS 3.1 · CISA ADP · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L)
    CISA ADP ↗
  5. 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-2026-85226↗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-2026-77756 · cve.blacktree.nl