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Ubuntu Security Notice USN-7968-1
January 19, 2026

apache2 vulnerabilities
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A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

Several security issues were fixed in Apache HTTP Server.

Software Description:
- apache2: Apache HTTP server

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 �sander 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 �sander 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                         2.4.64-1ubuntu3.2

Ubuntu 24.04 LTS
  apache2                         2.4.58-1ubuntu8.10

Ubuntu 22.04 LTS
  apache2                         2.4.52-1ubuntu4.18

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

References:
  https://ubuntu.com/security/notices/USN-7968-1
  CVE-2025-55753, CVE-2025-58098, CVE-2025-65082, CVE-2025-66200

Package Information:
  https://launchpad.net/ubuntu/+source/apache2/2.4.64-1ubuntu3.2
  https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.10
  https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.18