Connect your agent
AdvisoriesCriticalCheck your lockfilePluginHow it worksPricing Connect your agent

Advisory record · GHSA-whxr-3p84-rf3c

Apache ActiveMQ: Unchecked buffer length can cause excessive memory allocation

CVSS 6.9 MediumEPSS 0.091 · 95th percentile

Published by the GitHub Advisory Database at 7 May 2025, 09:31 UTC. agentprime has not analysed this yet, so whether it affects any app is not known.

PackageEcosystemAffectedFixed in
org.apache.activemq:activemq-openwire-legacyMaven<5.16.8 || >=5.17.0, <5.17.7 || >=5.18.0, <5.18.7 || >=6.0.0, <6.1.65.16.8, 5.17.7, 5.18.7, 6.1.6
org.apache.activemq:activemq-clientMaven<5.16.8 || >=5.17.0, <5.17.7 || >=5.18.0, <5.18.7 || >=6.0.0, <6.1.65.16.8, 5.17.7, 5.18.7, 6.1.6
Identifiers
GHSA-whxr-3p84-rf3c · BIT-activemq-2025-27533 · CVE-2025-27533
Weakness (CWE)
CWE-789
Tags
Published
7 May 2025
Updated
10 Sept 2026

Machine-written summary

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

Apache ActiveMQ (packages activemq-openwire-legacy and activemq-client) versions before 5.16.8, from 5.17.0 before 5.17.7, from 5.18.0 before 5.18.7, and from 6.0.0 before 6.1.6 are affected. During unmarshalling of OpenWire commands, buffer sizes are not properly validated, so an attacker who can reach the broker without mutual TLS can cause excessive memory allocation and exhaust process memory, denying service. Upgrade to 5.16.8, 5.17.7, 5.18.7, or 6.1.6 or later; version 5.19.0 is not affected. Enabling mutual TLS mitigates the risk.

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
6.9 Medium 4.0 CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/AU:Y/R:A/V:D/RE:M/U:Red CNA (apache)
  • CISA KEV Not listed.
  • EPSS 0.091, the 95th percentile, on 13 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.