Use After Free in Apache HTTP Server mod_rewrite (LA-U), 2.4.0-2.4.68
CVE-2026-56154 Published on October 1, 2026
Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}
Use After Free vulnerability in Apache HTTP Server's mod_rewrite when using lookahead (%{LA-U:HTTP:...})
This issue affects Apache HTTP Server: from 2.4.0 through 2.4.68.
Vulnerability Analysis
CVE-2026-56154 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to be critical as this vulnerability has a high impact to the confidentiality, integrity and availability of this component.
Timeline
reported
fixed in 2.4.x by r1938660 129 days later.
2.4.69 released
Weakness Type
What is a Dangling pointer Vulnerability?
Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code.
CVE-2026-56154 has been classified to as a Dangling pointer vulnerability or weakness.
Products Associated with CVE-2026-56154
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Affected Versions
Apache Software Foundation Apache HTTP Server:- Version 2.4.0, <= 2.4.68 is affected.