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Advisory record · GHSA-4j3c-42xv-3f84

Apache Tomcat is vulnerable to resource exhaustion when using the APR/Native connector

CVSS 7.5 HighEPSS 0.021 · 81st percentile

Published by the GitHub Advisory Database at 10 Jul 2025, 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>=9.0.0.M1, <9.0.107 || >=8.5.0, <=8.5.1009.0.107
org.apache.tomcat.embed:tomcat-embed-coreMaven>=9.0.0.M1, <9.0.107 || >=8.5.0, <=8.5.1009.0.107
Identifiers
GHSA-4j3c-42xv-3f84 · BIT-tomcat-2025-52434 · CVE-2025-52434
Weakness (CWE)
CWE-362
Tags
Published
10 Jul 2025
Updated
1 Jul 2026

Machine-written summary

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

Apache Tomcat's APR/Native connector (tomcat-coyote, tomcat-embed-core) is affected from 9.0.0.M1 through 9.0.106 and 8.5.0 through 8.5.100. A race condition, most noticeable when clients close HTTP/2 connections, can cause resource exhaustion. Upgrade to 9.0.107, which fixes 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
7.5 High 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H GitHub Advisory Database
  • CISA KEV Not listed.
  • EPSS 0.021, the 81st percentile, on 13 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

  1. 31 Oct 2026, 14:20 UTC First seen by agentprime
  2. 31 Oct 2026, 14:20 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.