CVE-2026-66276 — MEDIUM (6.5)

Q: How severe is CVE-2026-66276?

CVE-2026-66276 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-2026-66276?

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

Vulnerability Description

An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, 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.

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-606

References

https://lists.apache.org/thread/14nj0lpsqpnd3q0hw0t0tw44qvdo1jc2Mailing ListVendor Advisory
http://www.openwall.com/lists/oss-security/2026/08/04/12Mailing ListThird Party Advisory

FAQ

What is CVE-2026-66276?

CVE-2026-66276 is a vulnerability with a CVSS score of 6.5 (MEDIUM). An authenticated attacker can craft a disposition frame with large or illegal ranges causing excessive CPU usage due to naive range handling, leading to denial of service. This issue affects Apache Q...

How severe is CVE-2026-66276?

CVE-2026-66276 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-2026-66276?

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