What is CVE-2026-67551?

CVE-2026-67551 is a high-severity vulnerability in Apache Qpid Proton-Dotnet, classified under CWE-789. CVSS score: 7.5/10. Published 2026-08-05.

How severe is CVE-2026-67551?

High severity. CVSS v3 base score is 7.5 out of 10.

Vulnerability in Apache Qpid Proton-Dotnet

CVE-2026-67551

pre-authentication attacker could leverage type size/count handling to cause excessive allocation leading to potential denial of service. This issue affects Apache Qpid Proton-Dotnet: through 1.0.0. Users are recommended to upgrade to version 1.1.0, which fixes the issue.

EPSS: 0.005 (41.4th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

Affected products

Apache Qpid_proton-dotnet
Apache Software Foundation Qpid Proton Dotnet — versions 0

Weakness classification (CWE)

CWE-789

References

security@apache.org (vendor-advisory, Vendor Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Third Party Advisory)

Frequently asked questions

What is CVE-2026-67551?: CVE-2026-67551 is a high-severity vulnerability in Apache Qpid Proton-Dotnet, classified under CWE-789. CVSS score: 7.5/10. Published 2026-08-05.
How severe is CVE-2026-67551?: High severity. CVSS v3 base score is 7.5 out of 10.