Medium [CVE-2026-66275] Denial of Service via exceeding session flow control window
This medium-severity Red Hat Linux advisory covers CVE-2026-66275 affecting Red Hat AMQ Broker 7, Red Hat build of Apache Camel 4 for Quarkus 3, Red Hat build of Apache Camel for Spring Boot 4.
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Summary
An authenticated attacker could exceed the session flow control incoming window potentially 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. This action could lead to a denial of service (DoS), making the system unavailable to legitimate users.
All affected versions are set to AFFECTED/DEFER as the CVSS score (6.5) is below the 7.0 threshold for immediate remediation. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-770. Affected Red Hat products: Red Hat AMQ Broker 7; Red Hat build of Apache Camel 4 for Quarkus 3; Red Hat build of Apache Camel for Spring Boot 4; Red Hat build of Quarkus; Red Hat Fuse 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat JBoss Enterprise Application Platform Expansion Pack.
Red Hat does not currently list a fixing RHSA for this CVE.
- 0.34.1
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
Mitigation checklist
- Ensure authenticated access to AMQP endpoints is restricted to trusted clients.
Official advisory · high-confidence parse· fetched 1 hour ago·verify at source
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