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Message-ID: <79db2087-9a82-9ad5-7cf9-7c423c6458a5@apache.org>
Date: Mon, 29 Jun 2026 18:35:21 +0000
From: "Christopher L. Shannon" <cshannon@...che.org>
To: oss-security@...ts.openwall.com
Subject: CVE-2026-50734: Apache ActiveMQ Client, Apache ActiveMQ, Apache
ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during
wire format negotiation
Severity: important
Affected versions:
- Apache ActiveMQ Client (org.apache.activemq:activemq-client) before 5.19.8
- Apache ActiveMQ Client (org.apache.activemq:activemq-client) 6.0.0 before 6.2.7
- Apache ActiveMQ (org.apache.activemq:apache-activemq) before 5.19.8
- Apache ActiveMQ (org.apache.activemq:apache-activemq) 6.0.0 before 6.2.7
- Apache ActiveMQ All (org.apache.activemq:activemq-all) before 5.19.8
- Apache ActiveMQ All (org.apache.activemq:activemq-all) 6.0.0 before 6.2.7
Description:
Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All.
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.
Credit:
Andrej Tomci (finder)
References:
https://activemq.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-50734
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