Medium [CVE-2026-67591] Denial of Service via exceeding session flow control window
This medium-severity Red Hat Linux advisory covers CVE-2026-67591 affecting Red Hat AMQ Broker 7.
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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 ProtonJ2: through 1.1.0.
Users are recommended to upgrade to version 1.2.0, which fixes the issue. This can lead to a denial of service (DoS), making the system unavailable to legitimate users.
The affected components are set to AFFECTED/DEFER as the CVSS score (6.5) is below the 7.0 threshold for immediate remediation. Note: the substring-matched artifacts are ancillary (parent POM, test driver) — the core protonj2-client library was not found via strict search.
The affects are precautionary. 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 does not currently list a fixing RHSA for this CVE.
- 1.1.0
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
Mitigation checklist
- Ensure authenticated access to AMQP endpoints is restricted to trusted clients to limit exposure to this DoS vulnerability.
Official advisory · high-confidence parse· fetched 11 days ago·verify at source
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