CVE-2026-66277: Apache Qpid Proton-J

Medium severity, CVSS 6.5. EPSS: 0.7% chance of exploitation in the next 30 days.

It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential denial of service. This issue affects Apache Qpid Proton-J: through 0.34.1. Users are recommended to upgrade to version 0.35.0, which fixes the issue.

Affected products

• Apache Qpid Proton-J: before 0.35.0 (fixed in 0.35.0)

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