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Advisory record · GHSA-qq5r-98hh-rxc9

Apache Tomcat - Security constraint bypass with HTTP/0.9

CVSS 6.5 MediumEPSS 0.0058 · 48th percentile

Published by the GitHub Advisory Database at 17 Feb 2026, 21:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.tomcat:tomcat-coyoteMaven>=11.0.0-M1, <11.0.15 || >=10.1.0-M1, <10.1.50 || <9.0.11311.0.15, 10.1.50, 9.0.113
Identifiers
GHSA-qq5r-98hh-rxc9 · BIT-tomcat-2026-24733 · CVE-2026-24733
Weakness (CWE)
CWE-20
Tags
Published
17 Feb 2026
Updated
11 Sept 2026

Machine-written summary

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

Apache Tomcat tomcat-coyote versions 11.0.0-M1 through 11.0.14, 10.1.0-M1 through 10.1.49, and 9.0.0.M1 through 9.0.112 are affected. A remote attacker can send an HTTP/0.9 HEAD request to bypass a security constraint that allows HEAD but denies GET on the same URI, gaining GET access they should not have. Upgrade to tomcat-coyote 11.0.15, 10.1.50, or 9.0.113 or later, which fix the issue.

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
6.5 Medium 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N ADP (CISA-ADP)
  • CISA KEV Not listed.
  • EPSS 0.0058, the 48th percentile, on 12 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:16 UTC First seen by agentprime
  2. 31 Oct 2026, 14:16 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.