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Advisory record · GHSA-r29c-68gh-xp6x

Apache Tomcat - HTTP/2 request headers not validated

CVSS 9.8 CriticalCriticalEPSS 0.017 · 77th percentile

Critical, because:

  • CVSS score 9.8: 9.0 or more.

How we decide what’s critical

Published by the GitHub Advisory Database at 12 May 2026, 18:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.tomcat.embed:tomcat-embed-coreMaven>=8.5.0, <9.0.118 || >=10.1.0-M1, <10.1.55 || >=11.0.0-M1, <11.0.229.0.118, 10.1.55, 11.0.22
org.apache.tomcat:tomcatMaven>=8.5.0, <9.0.118 || >=10.1.0-M1, <10.1.55 || >=11.0.0-M1, <11.0.229.0.118, 10.1.55, 11.0.22
org.apache.tomcat:tomcat-coyoteMaven>=8.5.0, <9.0.118 || >=10.1.0-M1, <10.1.55 || >=11.0.0-M1, <11.0.229.0.118, 10.1.55, 11.0.22
Identifiers
GHSA-r29c-68gh-xp6x · BIT-tomcat-2026-41293 · CVE-2026-41293
Weakness (CWE)
CWE-20
Tags
Published
12 May 2026
Updated
10 Sept 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

Apache Tomcat (tomcat-embed-core, tomcat, and tomcat-coyote Maven packages) versions 8.5.0 up to but not including 9.0.118, 10.1.0-M1 up to but not including 10.1.55, and 11.0.0-M1 up to but not including 11.0.22 do not validate HTTP/2 request headers. The source gives few details on the exact impact: an application that assumes header values exposed through the Servlet API are specification compliant may behave unexpectedly. Upgrade to 9.0.118, 10.1.55, 11.0.22, or a later release in the same line.

Written 2 Nov 2026.

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.017, the 77th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:17 UTC First seen by agentprime
  2. 31 Oct 2026, 14:17 UTC Confirmed by OSV

Sources

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.