Allocation of Resources Without Limits or Throttling in Apache Qpid ProtonJ2 - CVE-2026-67591
Published: August 25, 2026
Vulnerability identifier: #VU145167
CSH Severity: Low
CVSS v4: 7.1 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-67591
CWE-ID: CWE-770
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote user to cause a denial of service.
The vulnerability exists due to improper enforcement of flow control limits in incoming session flow control handling when processing session flow control updates. A remote user can exceed the session flow control incoming window to cause a denial of service.
Affected software
Apache Qpid ProtonJ2
How to mitigate CVE-2026-67591
Install security update from vendor's website.
Apache Qpid ProtonJ2 - update to 1.2.0