CVE-2026-66276: Apache Qpid Proton-J

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

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading to 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.