CVE-2026-67591 — MEDIUM (6.5)

Q: How severe is CVE-2026-67591?

CVE-2026-67591 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Q: Is there a patch for CVE-2026-67591?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Qpid Protonj2.

Vulnerability Description

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.

CVSS Score

6.5

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Apache	Qpid Protonj2	< 1.2.0

Related Weaknesses (CWE)

CWE-770

References

https://lists.apache.org/thread/rwmggh2bkm6qotxpdfcplht3jgw5n036Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/30Mailing ListThird Party Advisory

FAQ

What is CVE-2026-67591?

CVE-2026-67591 is a vulnerability with a CVSS score of 6.5 (MEDIUM). 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 recommende...

How severe is CVE-2026-67591?

CVE-2026-67591 has been rated MEDIUM with a CVSS base score of 6.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-67591?

Check the references section above for vendor advisories and patch information. Affected products include: Apache Qpid Protonj2.