CVE-2026-50734

highCVSS 7.5covered by 1 sourcefirst seen 2026-06-30

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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Exploitation outlook

Low exploitation risk0.80% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 52% of all EPSS-scored CVEs.

Advisory coverage (1)

highCVE-2026-50734: Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache Ac…nvd · 2026-06-30

External references

NVD record for CVE-2026-50734

CVE.org record

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