---
id: CVE-2026-50734
aliases:
  - GHSA-7259-vf48-52q3
title: >-
  Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All has a Memory
  Allocation with Excessive Size Value vulnerability
summary: >-
  Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All has a Memory
  Allocation with Excessive Size Value vulnerability
severity: high
cvss: 7.5
cwe:
  - CWE-789
vendor: apache
product: 'org.apache.activemq:activemq-client'
ecosystem: maven
affected:
  - 'org.apache.activemq:activemq-client < 5.19.8'
  - 'org.apache.activemq:activemq-client >= 6.0.0, < 6.2.7'
  - 'org.apache.activemq:apache-activemq < 5.19.8'
  - 'org.apache.activemq:apache-activemq >= 6.0.0, < 6.2.7'
  - 'org.apache.activemq:activemq-all < 5.19.8'
  - 'org.apache.activemq:activemq-all >= 6.0.0, < 6.2.7'
patched:
  - 'org.apache.activemq:activemq-client 5.19.8'
  - 'org.apache.activemq:activemq-client 6.2.7'
  - 'org.apache.activemq:apache-activemq 5.19.8'
  - 'org.apache.activemq:apache-activemq 6.2.7'
  - 'org.apache.activemq:activemq-all 5.19.8'
  - 'org.apache.activemq:activemq-all 6.2.7'
published: '2026-06-30'
updated: '2026-11-04'
sourceUpdated: '2026-11-04T15:59:58Z'
source: GHSA
sourceUrl: 'https://github.com/advisories/GHSA-7259-vf48-52q3'
references:
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-50734'
  - url: 'https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0'
  - url: 'http://www.openwall.com/lists/oss-security/2026/06/29/10'
  - url: 'https://github.com/apache/activemq/pull/2080'
  - url: >-
      https://github.com/apache/activemq/commit/42e2be75eddcece3cddacf8a73e6cad7db5aa626
  - url: >-
      https://github.com/apache/activemq/commit/6fc46e520bac7d9763ba5762cc2de603f19ed517
  - url: >-
      https://github.com/apache/activemq/commit/e25f9b88898ef7cdfac9e855f4559a1ad0a6da12
  - url: 'https://github.com/apache/activemq/releases/tag/activemq-5.19.8'
  - url: 'https://github.com/apache/activemq/releases/tag/activemq-6.2.7'
  - url: 'https://github.com/advisories/GHSA-7259-vf48-52q3'
tags:
  - ghsa
  - maven
epss: 0.0074
epssPercentile: 0.54726
ingestedAt: '2026-11-04T16:18:35.578Z'
---

## Overview

An unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker.
This issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; 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.

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

## Affected packages

- `org.apache.activemq:activemq-client < 5.19.8`
- `org.apache.activemq:activemq-client >= 6.0.0, < 6.2.7`
- `org.apache.activemq:apache-activemq < 5.19.8`
- `org.apache.activemq:apache-activemq >= 6.0.0, < 6.2.7`
- `org.apache.activemq:activemq-all < 5.19.8`
- `org.apache.activemq:activemq-all >= 6.0.0, < 6.2.7`

## Remediation

Upgrade to a patched release:

- `org.apache.activemq:activemq-client 5.19.8`
- `org.apache.activemq:activemq-client 6.2.7`
- `org.apache.activemq:apache-activemq 5.19.8`
- `org.apache.activemq:apache-activemq 6.2.7`
- `org.apache.activemq:activemq-all 5.19.8`
- `org.apache.activemq:activemq-all 6.2.7`