CVE-2026-50734 PUBLISHED

Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation

Assigner: apache
Reserved: 05.06.2026 Published: 30.06.2026 Updated: 30.06.2026

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.

Product Status

Vendor Apache Software Foundation
Product Apache ActiveMQ Client
Versions Default: unaffected
  • affected from 0 to 5.19.8 (excl.)
  • affected from 6.0.0 to 6.2.7 (excl.)
Vendor Apache Software Foundation
Product Apache ActiveMQ
Versions Default: unaffected
  • affected from 0 to 5.19.8 (excl.)
  • affected from 6.0.0 to 6.2.7 (excl.)
Vendor Apache Software Foundation
Product Apache ActiveMQ All
Versions Default: unaffected
  • affected from 0 to 5.19.8 (excl.)
  • affected from 6.0.0 to 6.2.7 (excl.)

Credits

  • Andrej Tomci finder

References

Problem Types

  • CWE-789 Memory Allocation with Excessive Size Value CWE