Race condition in Apache HTTP Server - CVE-2026-119618
Published: November 11, 2026
Vulnerability identifier: #VU165851
CSH Severity: High
CVSS v4: 9.2 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-119618
CWE-ID: CWE-362
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code.
The vulnerability exists due to improper synchronization of a shared resource in mod_http2's assign_headers() function when processing requests concurrently. A remote attacker can trigger concurrent access to the shared resource to corrupt heap memory and potentially execute arbitrary code.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-119618
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.71