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HIGH severity

CVE-2026-24734 — tomcat-coyote

HIGHFix: apache/tomcat-native@69a977d

CVE-2026-24734 is a high-severity (CVSS 7.4) Improper Input Validation vulnerability in org.apache.tomcat:tomcat-coyote. A fix is available for org.apache.tomcat:tomcat-coyote — see the affected versions and patch details below.

Apache Tomcat Native, Apache Tomcat: OCSP revocation bypass

Also known asBIT-tomcat-2026-24734GHSA-mgp5-rv84-w37q
Published
Updated
Affected
9 pkgs
Patched
9 / 9
Exploits
None indexed
Exploitation data as of Nov 10, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-24734.

EPSS Exploitation Probability

via FIRST.org ↗
0.6%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs48th percentile — riskier than 48% of all scored CVEsHighest risk
0.00%0.36%0.72%1.08%0.1%0.6%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

9 pkgs affected
☕org.apache.tomcat:tomcat-coyote☕org.apache.tomcat:tomcat-coyote☕org.apache.tomcat:tomcat-coyote☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat.embed:tomcat-embed-core☕org.apache.tomcat:tomcat-coyote-ffm☕org.apache.tomcat:tomcat-coyote-ffm+1 more

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Improper Input Validation vulnerability in Apache Tomcat Native, Apache Tomcat.

When using an OCSP responder, Tomcat Native (and Tomcat's FFM port of the Tomcat Native code) did not complete verification or freshness checks on the OCSP response which could allow certificate revocation to be bypassed.

This issue affects Apache Tomcat Native:  from 1.3.0 through 1.3.4, from 2.0.0 through 2.0.11; Apache Tomcat: from 11.0.0-M1 through 11.0.17, from 10.1.0-M7 through 10.1.51, from 9.0.83 through 9.0.114.

The following versions were EOL at the time the CVE was created but are known to be affected: from 1.1.23 through 1.1.34, from 1.2.0 through 1.2.39. Older EOL versions are not affected.

Apache Tomcat Native users are recommended to upgrade to versions 1.3.5 or later or 2.0.12 or later, which fix the issue.

Apache Tomcat users are recommended to upgrade to versions 11.0.18 or later, 10.1.52 or later or 9.0.115 or later which fix the issue.

Affected Packages

9 total 9 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.tomcat:tomcat-coyote≥ 11.0.0-M1&&< 11.0.1811.0.18org.apache.tomcat:tomcat-coyote:11.0.18
☕Mavenorg.apache.tomcat:tomcat-coyote≥ 10.1.0-M7&&< 10.1.5210.1.52org.apache.tomcat:tomcat-coyote:10.1.52
☕Mavenorg.apache.tomcat:tomcat-coyote≥ 9.0.83&&< 9.0.1159.0.115org.apache.tomcat:tomcat-coyote:9.0.115
☕Mavenorg.apache.tomcat.embed:tomcat-embed-core≥ 11.0.0-M1&&< 11.0.1811.0.18org.apache.tomcat.embed:tomcat-embed-core:11.0.18
☕Mavenorg.apache.tomcat.embed:tomcat-embed-core≥ 10.1.0-M7&&< 10.1.5210.1.52org.apache.tomcat.embed:tomcat-embed-core:10.1.52
☕Mavenorg.apache.tomcat.embed:tomcat-embed-core≥ 9.0.83&&< 9.0.1159.0.115org.apache.tomcat.embed:tomcat-embed-core:9.0.115

Affected Products

2 products · 51 configurations
Application
tomcatapache
≥ 11.0.1 && < 11.0.18
2 versions
10.1.011.0.0
Application
tomcat nativeapache
≥ 2.0.0 && < 2.0.12
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.tomcat:tomcat-coyote, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.tomcat:tomcat-coyote to 11.0.18 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-24734 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

This vulnerability doesn't affect the Apache Tomcat distributed with Red Hat Enterprise 8 and Red Hat Enterprise up to the version 9.7 as the vulnerable code is not built. The vulnerable code is compiled with Red Hat Enterprise Linux 9.8 and above.

ProductFixed inAdvisory
Red Hat Enterprise Linux 10tomcat-1:10.1.49-1.el10_2.1RHSA-2026:19054
Red Hat Enterprise Linux 10tomcat9-1:9.0.117-1.el10_2RHSA-2026:25341
Red Hat Enterprise Linux 9tomcat-1:9.0.117-1.el9_8RHSA-2026:26323
Red Hat JBoss Web Server 6.2.1tomcatRHSA-2026:5612
Red Hat JBoss Web Server 6.2 on RHEL 10jws6-tomcat-0:10.1.49-9.redhat_00007.1.el10jwsRHSA-2026:5611
Red Hat Hardened Imagestomcat11-main-11.0.21-0.1.hum1RHSA-2026:6569
Red Hat Hardened Imagestomcat10-main-10.1.54-1.hum1RHSA-2026:8334

Frequently Asked Questions

Improper Input Validation vulnerability in Apache Tomcat Native, Apache Tomcat. When using an OCSP responder, Tomcat Native (and Tomcat's FFM port of the Tomcat Native code) did not complete verification or freshness checks on the OCSP response which could allow certificate revocation to be bypassed. This issue affects Apache Tomcat Native:  from 1.3.0 through 1.3.4, from 2.0.0 through 2.0.11; Apache Tomcat: from 11.0.0-M1 through 11.0.17, from 10.1.0-M7 through 10.1.51, from 9.0.83 through 9.0.114. The following versions were EOL at the time the CVE was created but are known to be affect
O3 Security · Impact-Aware SCA

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CVE-2026-24734: tomcat-coyote — Fixed in 11.0.18