CVE-2026-67589: Apache Qpid PROTONJ2

High severity, CVSS 7.5. EPSS: 0.8% chance of exploitation in the next 30 days.

A pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential 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.

Affected products

• Apache Qpid PROTONJ2: before 1.2.0 (fixed in 1.2.0)

Published 2026-08-05. Last modified 2026-08-07.