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Full vulnerability report · 2026
CVE-2026-86243High confidence

Apache Tomcat Native: DoS via TLS handshake

Apache Software Foundation · Apache Tomcat Native

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 2 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 0.40% 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 Native 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 2 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.

5 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 2 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 · sourcetomcat-nativeAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian bookwormbookworm · sourcetomcat-nativeAffected, no fix publishedDebian currently tracks this release as open.Not published in this feedDebian Security Tracker ↗Source updated 5 Oct 2026
Debian forkyforky · sourcetomcat-nativeVendor fix publishedDebian records a fixed source-package version for this release.2.0.16-1Debian Security Tracker ↗Source updated 5 Oct 2026
Debian sidsid · sourcetomcat-nativeVendor fix publishedDebian records a fixed source-package version for this release.2.0.16-1Debian Security Tracker ↗Source updated 5 Oct 2026
Ubuntu 24.04 LTSnoble · standard archivetomcat-nativeUnder evaluationCanonical reports that the package might be affected and still needs evaluation or fixing.Not published in this feedCanonical Ubuntu Security ↗Source updated 4 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-2026-86243 · CSAF 2.0 · revision 4 · interimSUSE Product Security TeamCVE-2026-86243
368 known affected

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

  • libtcnative-1-0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libtcnative-2-0 as component of SUSE Linux Enterprise Desktop 15 SP7
  • libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP2
  • libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2
  • libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP3
  • libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP3
  • SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-1-0
  • SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-1-0-devel
  • SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-2-0
  • SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-2-0-devel
  • SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat
  • SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-admin-webapps
Summary
Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.
Remediation
To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or "zypper patch".
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-2026-85267

No EUVD known-exploited evidence

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, 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 2 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

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

What

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

Why

The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

What

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

Why

The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

How

An attacker operating through a network path may attempt exploitation without authentication or user interaction. If successful, the issue may disrupt the affected service.

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 → Buffer Over-read → disrupt the affected service
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-126 ↗

CWE-126: Buffer Over-read. The product reads from a buffer using buffer access mechanisms such as indexes or pointers that reference memory locations after the targeted buffer.

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.
NetworkUnauthenticatedDenial of serviceCWE-126
A

Official authority intelligence

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

ENISA EUVD · EUVD-2026-85267Official EUVD mapping

Buffer over-read vulnerability in Apache Tomcat Native during the TLS handshake permits a malicious user to trigger a DoS via a JVM crash. This issue affects Apache Tomcat Native: from 2.0.0 through 2.0.15, from 1.3.0 through 1.3.8. Earlier, unsupported versions may also be affected. Users are recommended to upgrade to version 1.3.9 or 2.0.16, which fix the issue.

Official EUVD record ↗
BSI · German · WID-SEC-2026-3559Apache Tomcat APR/native Connector: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Apache Tomcat APR/native Connector ausnutzen, um einen Denial of Service Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.

Official advisory ↗
CSIRT Italia · Italian · rilevate-vulnerabilita-in-apache-tomcat-2Rilevate vulnerabilità in Apache Tomcat

Apache ha rilasciato aggiornamenti di sicurezza per risolvere 15 vulnerabilità, di cui 4 con gravità "critica" e 9 con gravità "alta", in Apache Tomcat e Apache Tomcat Native. Tali vulnerabilità, qualora sfruttate, potrebbero consentire a un utente malintenzionato di eludere i meccanismi di sicurezza, alterare il contenuto delle richieste HTTP e compromettere la disponibilità del servizio sui sistemi interessati.

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
No fixed version is explicitly recorded in the structured CVE data.
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-126 · Buffer Over-read

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-2026-85267
Product sourceVendor CSAF · SUSE Product Security Team
Remediation sourceVendor CSAF · SUSE Product Security Team
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. Remediation statusRemediation status changed from Awaiting fix to Mitigation available.
    Before
    Awaiting fix
    After
    Mitigation available
    SUSE Product Security Team ↗
  2. Vendor guidanceAuthoritative vendor guidance changed from remediation: suse.com/CVE-2026-86243 to remediation: suse.com/CVE-2026-86243.
    Before
    remediation: suse.com/CVE-2026-86243
    After
    remediation: suse.com/CVE-2026-86243
    SUSE Product Security Team ↗
  3. Remediation statusRemediation status changed from Awaiting fix to Patch available.
    Before
    Awaiting fix
    After
    Patch available
    SUSE Product Security Team ↗
  4. Affected versionsThe structured affected or fixed version information changed.
    Before
    libtcnative-1-0 as component of SUSE Linux Enterprise Desktop 15 SP7; libtcnative-2-0 as component of SUSE Linux Enterprise Desktop 15 SP7; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP2; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP3; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP3; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-2-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-2-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4; libtcnative-2-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4; libtcnative-2-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS; libtcnative-2-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS; libtcnative-2-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP5-LTSS; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP5; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP5; libtcnative-2-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP5; libtcnative-2-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP5; libtcnative-1-0 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7; libtcnative-2-0 as component of SUSE Linux Enterprise Module for Basesystem 15 SP7; libtcnative-1-0 as component of SUSE Linux Enterprise Module for Web and Scripting 15 SP7; libtcnative-1-0-devel as component of SUSE Linux Enterprise Module for Web and Scripting 15 SP7; libtcnative-2-0 as component of SUSE Linux Enterprise Module for Web and Scripting 15 SP7; libtcnative-2-0-devel as component of SUSE Linux Enterprise Module for Web and Scripting 15 SP7; libtcnative-1-0 as component of SUSE Linux Enterprise Server 15 SP2-LTSS; libtcnative-1-0-devel as component of SUSE Linux Enterprise Server 15 SP2-LTSS; and 63 more
    After
    libtcnative-1-0 as component of SUSE Linux Enterprise Desktop 15 SP7; libtcnative-2-0 as component of SUSE Linux Enterprise Desktop 15 SP7; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP2; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP2; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP3; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP3; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-1-0; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-1-0-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-2-0; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:libtcnative-2-0-devel; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-admin-webapps; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-el-3_0-api; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-jsp-2_3-api; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-lib; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-servlet-4_0-api; SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS:tomcat-webapps; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-2-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; libtcnative-2-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat-admin-webapps; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat-el-3_0-api; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat-jsp-2_3-api; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat-lib; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat-servlet-4_0-api; SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS:tomcat-webapps; libtcnative-1-0 as component of SUSE Linux Enterprise High Performance Computing 15 SP4; libtcnative-1-0-devel as component of SUSE Linux Enterprise High Performance Computing 15 SP4; and 338 more
    SUSE Product Security Team ↗
  5. ENISA EUVD mappingEUVD-2026-85267 was added to the official ENISA EUVD mapping for this CVE.
    Before
    not recorded
    After
    {"euvdId":"EUVD-2026-85267"}
    ENISA EUVD ↗
  6. SeveritySeverity changed from Unknown to High.
    Before
    Unknown
    After
    High
    CISA ADP ↗
  7. 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 ↗
  8. Catalogue recordCVE added to the BlackTree catalogue.
    CNA ↗
Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
Remediation guidance recorded
ENISA EUVD · EUVD-2026-85267↗SUSE Product Security Team security advisory↗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-2026-86243 · cve.blacktree.nl