CVE-2026-66275

Apache Qpid Proton-J: Incoming session flow control window can be exceeded

State: Published
Severity: 6.5 Medium
Published: Aug 5, 2026
Updated: Aug 6, 2026
Reserved: Jul 24, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	6.5 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
Apache Qpid Proton-JApache Software Foundation	0.34.1 and earlierAffected

References

https://lists.apache.org/thread/jds59nxrgcxtlx7xl0kvl5hqt07thxztvendor-advisory
http://www.openwall.com/lists/oss-security/2026/08/04/11

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.