CVE-2026-50734
Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All has a Memory Allocation with Excessive Size Value vulnerability
Summary
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
| Ecosystem | Package | Affected versions | Fixed versions |
|---|---|---|---|
| Maven | org.apache.activemq:activemq-all | — | 5.19.8, 6.2.7 |
| Maven | org.apache.activemq:activemq-client | — | 5.19.8, 6.2.7 |
| Maven | org.apache.activemq:apache-activemq | — | 5.19.8, 6.2.7 |
Remediation: Upgrade to 5.19.8 or later.
References
Includes data from the GitHub Advisory Database, licensed under CC-BY 4.0.
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EPSS scores provided by the FIRST.org Exploit Prediction Scoring System.