Use-after-free in Apache HTTP Server - CVE-2026-56154
Published: October 1, 2026
Vulnerability identifier: #VU153099
CSH Severity: Low
CVSS v4: 0 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-56154
CWE-ID: CWE-416
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to trigger a use-after-free condition.
The vulnerability exists due to use-after-free in mod_rewrite when using lookahead (%{LA-U:HTTP:...}). A remote attacker can invoke the lookahead functionality to trigger a use-after-free condition.
Affected software
Apache HTTP Server
How to mitigate CVE-2026-56154
Install security update from vendor's website.
Apache HTTP Server - update to 2.4.69