CVE-2026-67588: Apache Qpid ProtonJ2: Unbounded symbol value caching can lead to pre-authentication resource exhaustion

["Timothy A. Bish" <tabish () apache org>]

Severity: important 

Affected versions:

- Apache Qpid ProtonJ2 (org.apache.qpid:protonj2) through 1.1.0

Description:

A pre-authentication attacker could leverage unbounded symbol value caching to cause resource exhaustion leading to 
denial of service.

This issue affects Apache Qpid ProtonJ2: through 1.1.0.

Users are recommended to upgrade to version 1.2.0, which fixes the issue.

References:

https://qpid.apache.org/
https://www.cve.org/CVERecord?id=CVE-2026-67588