Input validation error in Apache Qpid Proton-J - CVE-2026-66273
Published: August 24, 2026
Vulnerability identifier: #VU144809
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66273
CWE-ID: CWE-20
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to improper input validation in type size/count handling when parsing protocol data. A remote attacker can send crafted input values to cause a denial of service.
The issue can be triggered prior to authentication.
Affected software
Apache Qpid Proton-J
How to mitigate CVE-2026-66273
Install security update from vendor's website.
Apache Qpid Proton-J - update to 0.35.0