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[USN-8396-1] Apache HTTP Server vulnerabilities

Posted on 12 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8396-1
June 08, 2026

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

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 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 mod_rewrite module
incorrectly handled certain privileges. A local attacker could possibly use
this issue to obtain sensitive information. (CVE-2026-24072)

Andrew Lacambra, Elhanan Haenel, Tianshuo Han, and Tristan Madani
discovered that the Apache HTTP Server mod_proxy_ajp module incorrectly
handled certain AJP server messages. An attacker in control of a
backend AJP server could use this issue to cause Apache HTTP Server to
crash, resulting in a denial of service, or possibly execute arbitrary
code. (CVE-2026-28780)

Pavel Kohout discovered that the Apache HTTP Server incorrectly handled
certain memory operations in mod_dav_lock. A remote attacker could possibly
use this issue to cause Apache HTTP Server to crash, resulting in a denial
of service. (CVE-2026-29169)

Elhanan Haenel discovered that Apache HTTP Server incorrectly handled
certain memory operations in mod_proxy_ajp. A remote attacker could use
this issue to cause Apache HTTP Server to crash, resulting in a denial of
service, or possibly obtain sensitive information. (CVE-2026-34059)

Update instructions:

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

Ubuntu 20.04 LTS
apache2 2.4.41-4ubuntu3.23+esm4
Available with Ubuntu Pro
apache2-bin 2.4.41-4ubuntu3.23+esm4
Available with Ubuntu Pro
apache2-dev 2.4.41-4ubuntu3.23+esm4
Available with Ubuntu Pro
apache2-ssl-dev 2.4.41-4ubuntu3.23+esm4
Available with Ubuntu Pro
apache2-utils 2.4.41-4ubuntu3.23+esm4
Available with Ubuntu Pro
libapache2-mod-md 2.4.41-4ubuntu3.23+esm4
Available with Ubuntu Pro

Ubuntu 18.04 LTS
apache2 2.4.29-1ubuntu4.27+esm9
Available with Ubuntu Pro
apache2-bin 2.4.29-1ubuntu4.27+esm9
Available with Ubuntu Pro
apache2-dev 2.4.29-1ubuntu4.27+esm9
Available with Ubuntu Pro
apache2-ssl-dev 2.4.29-1ubuntu4.27+esm9
Available with Ubuntu Pro
apache2-utils 2.4.29-1ubuntu4.27+esm9
Available with Ubuntu Pro

Ubuntu 16.04 LTS
apache2 2.4.18-2ubuntu3.17+esm18
Available with Ubuntu Pro
apache2-bin 2.4.18-2ubuntu3.17+esm18
Available with Ubuntu Pro
apache2-data 2.4.18-2ubuntu3.17+esm18
Available with Ubuntu Pro
apache2-dev 2.4.18-2ubuntu3.17+esm18
Available with Ubuntu Pro
apache2-utils 2.4.18-2ubuntu3.17+esm18
Available with Ubuntu Pro

Ubuntu 14.04 LTS
apache2 2.4.7-1ubuntu4.22+esm13
Available with Ubuntu Pro
apache2-bin 2.4.7-1ubuntu4.22+esm13
Available with Ubuntu Pro
apache2-dev 2.4.7-1ubuntu4.22+esm13
Available with Ubuntu Pro
apache2-utils 2.4.7-1ubuntu4.22+esm13
Available with Ubuntu Pro
apache2.2-bin 2.4.7-1ubuntu4.22+esm13
Available with Ubuntu Pro

After a standard system update you need to restart apache2 to make
all the necessary changes.

References:
https://ubuntu.com/security/notices/USN-8396-1
CVE-2026-24072, CVE-2026-28780, CVE-2026-29169, CVE-2026-34059

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