CVE-2026-67554: Apache Qpid Proton-Dotnet

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-Dotnet: through 1.0.0. Users are recommended to upgrade to version 1.1.0, which fixes the issue.

Affected products

• Apache Qpid Proton-Dotnet: before 1.1.0 (fixed in 1.1.0)

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