Infinite loop in HAProxy - CVE-2026-26080
Published: February 12, 2026
Vulnerability identifier: #VU122781
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-2026-26080
CWE-ID: CWE-835
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to infinite loop when handling QUIC packets. A remote attacker can consume all available system resources and cause denial of service conditions.
Affected software
HAProxy
How to mitigate CVE-2026-26080
Install updates from vendor's website.
HAProxy - addressed in versions 3.2.12, 3.3.3