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HIGHFixed upstream
CVE-2026-50734
Apache ActiveMQ pre-authentication OpenWire memory allocation during wire format negotiation
Technology
Apache ActiveMQ
CVSS Score
7.5 / 10.0
Affected Versions
before 5.19.8; 6.0.0 before 6.2.7
Upstream Fix
5.19.8 and 6.2.7
Published
June 30, 2026
OSSeva Coverage
Fixed upstream
Description
An unauthenticated network attacker can send a WireFormatInfo frame with a very large size value. The broker does not validate it and tries to allocate the memory during pre-authentication negotiation, which can run it out of memory and crash it. Apache rates the issue important; the 7.5 score on NVD is from CISA-ADP.
Is your Apache ActiveMQ deployment affected?
If you're running before 5.19.8; 6.0.0 before 6.2.7, you need this patch. Book a discovery call to get covered.