CVE-2026-66277 — MEDIUM (6.5)

Q: How severe is CVE-2026-66277?

CVE-2026-66277 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-2026-66277?

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

Vulnerability Description

It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential 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.

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 Proton-J	< 0.35.0

Related Weaknesses (CWE)

CWE-770

References

https://lists.apache.org/thread/48tflr3sx0sxq9bcdy5rh06oy3gmwx02Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/13Mailing ListThird Party Advisory

FAQ

What is CVE-2026-66277?

CVE-2026-66277 is a vulnerability with a CVSS score of 6.5 (MEDIUM). It was not possible to govern the maximum number of transfer frames per incoming delivery, enabling an authenticated attacker to cause excessive resource usage and potential denial of service. This i...

How severe is CVE-2026-66277?

CVE-2026-66277 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-2026-66277?

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