Use-after-free in OpenBSD - #VU122239
Published: February 2, 2026
Vulnerability identifier: #VU122239
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: N/A
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform a denial of service attack.
The vulnerability exists due to a use-after-free error when handling HTTP requests with chuncked encoding in server_http.c within httpd(8). A remote non-authenticated attacker can send a specially crafted HTTP request and perform a denial of service attack.
Affected software
OpenBSD
Remediation
Install updates from vendor's website.