Bug 2494841 (CVE-2026-50734) - CVE-2026-50734 Apache ActiveMQ Client: Apache ActiveMQ: Apache ActiveMQ All: Apache ActiveMQ: Denial of Service via crafted WireFormatInfo frame
Summary: CVE-2026-50734 Apache ActiveMQ Client: Apache ActiveMQ: Apache ActiveMQ All: ...
Keywords:
Status: NEW
Alias: CVE-2026-50734
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On: 2495075 2495076
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-06-30 11:01 UTC by OSIDB Bzimport
Modified: 2026-06-30 19:07 UTC (History)
56 users (show)

Fixed In Version:
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Description OSIDB Bzimport 2026-06-30 11:01:56 UTC 
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.
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