[USN-7968-2] Apache HTTP Server regression

==========================================================================
Ubuntu Security Notice USN-7968-2
March 09, 2026

apache2 regression
==========================================================================

A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

USN-7968-1 introduced a regression in Apache HTTP Server

Software Description:
- apache2: Apache HTTP server

Details:

USN-7968-1 fixed vulnerabilities in Apache HTTP Server. The update
introduced a regression in mod_md where the MDStapleOthers setting was
ignored which resulted in OCSP being broken for some domains. This update
fixes the problem.

We apologize for the inconvenience.

Original advisory details:

It was discovered that the Apache HTTP Server incorrectly handled failed
ACME certificate renewals. This could result in renewal attempts to be
repeated without delays, possibly leading to a denial of service.
(CVE-2025-55753)

Anthony Parfenov discovered that the Apache HTTP Server would pass the
query string to cmd directives when configured with Server Side Includes
(SSI) enabled and mod_cgid. An attacker could possibly use this issue to
execute arbitrary code. (CVE-2025-58098)

Mattias Åsander discovered that the Apache HTTP Server incorrectly
neutralized certain environment variables. This could result in
unexpectedly superseding variables calculated by the server for CGI
programs. (CVE-2025-65082)

Mattias Åsander discovered that the Apache HTTP Server incorrectly
handled AllowOverride FileInfo configurations when using mod_userdir with
suexec. An attacker with access to use the RequestHeader directive in
htaccess can cause some CGI scripts to run under an unexpected userid.
(CVE-2025-66200)

Update instructions:

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 25.10
apache2 2.4.64-1ubuntu3.3

Ubuntu 24.04 LTS
apache2 2.4.58-1ubuntu8.11

Ubuntu 22.04 LTS
apache2 2.4.52-1ubuntu4.19

In general, a standard system update will make all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-7968-2
https://ubuntu.com/security/notices/USN-7968-1
https://bugs.launchpad.net/bugs/2142766

Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.64-1ubuntu3.3
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.11
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.19