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Advisory record · GHSA-3p2h-wqq4-wf4h

Apache Tomcat Denial of Service via invalid HTTP priority header

CVSS 7.5 HighCriticalEPSS 0.61 · 99th percentile

Critical, because:

  • CVSS score 7.5 (7.0 or more) and EPSS 0.61 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the GitHub Advisory Database at 28 Apr 2025, 21:30 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.tomcat:tomcat-coyoteMaven>=9.0.76, <9.0.104 || >=10.1.10, <10.1.40 || >=11.0.0-M2, <11.0.6 || >=8.5.0, <=8.5.1009.0.104, 10.1.40, 11.0.6
org.apache.tomcat.embed:tomcat-embed-coreMaven>=9.0.76, <9.0.104 || >=10.1.10, <10.1.40 || >=11.0.0-M2, <11.0.6 || >=8.5.0, <=8.5.1009.0.104, 10.1.40, 11.0.6
Identifiers
GHSA-3p2h-wqq4-wf4h · BIT-tomcat-2025-31650 · CVE-2025-31650
Weakness (CWE)
CWE-459 · CWE-460
Tags
Published
28 Apr 2025
Updated
10 Sept 2026

Machine-written summary

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

Apache Tomcat (tomcat-coyote and tomcat-embed-core packages) is affected in versions 9.0.76 through 9.0.102, 10.1.10 through 10.1.39, 11.0.0-M2 through 11.0.5, and 8.5.90 through 8.5.100. An attacker can send a large number of HTTP requests with invalid priority headers, which leaves failed requests incompletely cleaned up, causing a memory leak that can lead to an OutOfMemoryError and denial of service. Upgrade to Tomcat 9.0.104, 10.1.40, or 11.0.6.

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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H ADP (CISA-ADP)
  • CISA KEV Not listed.
  • EPSS 0.61, the 99th percentile, on 5 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.