Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Apache | Activemq | < 5.19.8 |
Related Weaknesses (CWE)
References
- https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0Vendor AdvisoryMailing List
- http://www.openwall.com/lists/oss-security/2026/06/29/10Third Party Advisory
FAQ
What is CVE-2026-50734?
CVE-2026-50734 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 craf...
How severe is CVE-2026-50734?
CVE-2026-50734 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-50734?
Check the references section above for vendor advisories and patch information. Affected products include: Apache Activemq.