CVE-2026-67591
MEDIUM
CVSS 6.5
Java
Verified Advisory
Denial of service via session flow control bypass in Apache Qpid ProtonJ2 (CVE-2026-67591)
An authenticated attacker can exceed the session flow control incoming window in Apache Qpid ProtonJ2, violating protocol-level constraints. This can potentially lead to a denial of service condition on affected systems.
Affected versions:
- Apache Qpid ProtonJ2 (org.apache.qpid:protonj2) through 1.1.0
We recommend updating to: 1.2.0.
CVSS ? · our assessment: act_now
Reference: https://seclists.org/oss-sec/2026/q3/430
Details: https://vuln.today/cve/CVE-2026-67591
Verified by vuln.today against published advisories.
Affected versions
- – Apache Qpid ProtonJ2 (org.apache.qpid:protonj2) through 1.1.0
Fixed in: 1.2.0
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