CVE-2026-56154 — Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}

Affected: Apache Software Foundation Apache HTTP Server

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.

USN-8898-1 — apache2 vulnerabilities

Affected: Ubuntu:Pro:14.04:LTS: apache2, Ubuntu:Pro:16.04:LTS: apache2, Ubuntu:Pro:18.04:LTS: apache2, Ubuntu:Pro:20.04:LTS: apache2, Ubuntu:22.04:LTS: apache2, Ubuntu:24.04:LTS: apache2, Ubuntu:26.04:LTS: apache2

It was discovered that Apache HTTP Server's mod_rewrite module incorrectly handled memory when performing certain variable lookups. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-56154)

Lucian Nitescu, Simon Kappel, and Gianluca Danesin discovered that Apache HTTP Server's mod_http2 module incorrectly handled memory when processing certain HTTP/2 connections. A remote attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (CVE-2026-57941)

Juthawong Naisanguansee, Charles Vosburgh, Mike Read, and Ryoma Nishioka discovered that Apache HTTP Server's mod_ssl module incorrectly handled certain expressions. An attacker could possibly use this issue to bypass intended access restrictions. (CVE-2026-59797)

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CVE-2026-56154 — Apache HTTP Server: mod_rewrite use-after-free via %{LA-U:HTTP:...}

USN-8898-1 — apache2 vulnerabilities