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HIGH severity

CVE-2026-49432 — apache-activemq

HIGHFix: apache/activemq#2064

CVE-2026-49432 is a high-severity (CVSS 7.5) Improper Input Validation vulnerability in org.apache.activemq:apache-activemq. A fix is available for org.apache.activemq:apache-activemq — see the affected versions and patch details below.

Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: STOMP negative content-length enables denial of service

Also known asBIT-activemq-2026-49432GHSA-xjwq-9jw5-jf7w
Published
Updated
Affected
6 pkgs
Patched
6 / 6
Exploits
None indexed
Exploitation data as of Nov 3, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2026-49432.

EPSS Exploitation Probability

via FIRST.org ↗
0.8%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs56th percentile — riskier than 56% of all scored CVEsHighest risk
0.02%0.44%0.86%1.29%0.5%0.8%Jul 26Oct 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

6 pkgs affected
☕org.apache.activemq:apache-activemq☕org.apache.activemq:apache-activemq☕org.apache.activemq:activemq-all☕org.apache.activemq:activemq-all☕org.apache.activemq:activemq-stomp☕org.apache.activemq:activemq-stomp

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Maven packages — download data is not available via public APIs for these ecosystems.

Description

Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp.

A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Stomp: before 5.19.8, from 6.0.0 before 6.2.7.

Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.

Affected Packages

6 total 6 fixed
EcosystemPackageVulnerable rangeFix
☕Mavenorg.apache.activemq:apache-activemqall versions5.19.8org.apache.activemq:apache-activemq:5.19.8
☕Mavenorg.apache.activemq:apache-activemq≥ 6.0.0&&< 6.2.76.2.7org.apache.activemq:apache-activemq:6.2.7
☕Mavenorg.apache.activemq:activemq-allall versions5.19.8org.apache.activemq:activemq-all:5.19.8
☕Mavenorg.apache.activemq:activemq-all≥ 6.0.0&&< 6.2.76.2.7org.apache.activemq:activemq-all:6.2.7
☕Mavenorg.apache.activemq:activemq-stompall versions5.19.8org.apache.activemq:activemq-stomp:5.19.8
☕Mavenorg.apache.activemq:activemq-stomp≥ 6.0.0&&< 6.2.76.2.7org.apache.activemq:activemq-stomp:6.2.7

Affected Products

1 product · 2 configurations
Application
activemqapache
≥ 6.0.0 && < 6.2.7
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for org.apache.activemq:apache-activemq, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update org.apache.activemq:apache-activemq to 5.19.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2026-49432 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatImportant

Red Hat products ship Apache ActiveMQ Classic components as transitive dependencies. The vulnerability is in the Classic ActiveMQ STOMP connector's content-length validation, allowing an unauthenticated attacker to cause OOM via a negative content-length value. Apache ActiveMQ Artemis, which powers Red Hat AMQ Broker,…

Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: Red Hat security advisory for CVE-2026-49432 (CC BY 4.0)
ProductFixed inAdvisory
Red Hat AMQ Broker 7.13.6artemis-stomp-protocolRHSA-2026:66545
Red Hat AMQ Broker 7.14.1artemis-stomp-protocolRHSA-2026:66488

Frequently Asked Questions

Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp. A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. This issue affects Apache ActiveMQ: before 5.19.8, fr
O3 Security · Impact-Aware SCA

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CVE-2026-49432: apache-activemq — Fixed in 5.19.8