USN-8931-1: Apache HTTP Server vulnerabilities

Publication date

14 October 2026

Overview

Several security issues were fixed in Apache HTTP Server.


Packages

Details

이지웅 discovered that Apache HTTP Server exposed WebDAV property information.
A remote attacker could possibly use this issue to obtain sensitive
information. (CVE-2026-58415)

Zhen Kong and Charles Vosburgh discovered that Apache HTTP Server did not
properly validate FTP server responses. A remote attacker could possibly
use this issue to make a forward proxy connect to an arbitrary host.
(CVE-2026-63045)

Hyojae Lee and Zhen Kong discovered that Apache HTTP Server incorrectly
handled certain HTTP requests. A remote attacker could possibly use this
issue to cause a denial of service or execute arbitrary code.
(CVE-2026-63292)

Lucian Nitescu and Zhen Kong discovered that Apache HTTP Server did not
properly handle certain responses from backend servers. A remote attacker
could possibly use this issue to cause...

이지웅 discovered that Apache HTTP Server exposed WebDAV property information.
A remote attacker could possibly use this issue to obtain sensitive
information. (CVE-2026-58415)

Zhen Kong and Charles Vosburgh discovered that Apache HTTP Server did not
properly validate FTP server responses. A remote attacker could possibly
use this issue to make a forward proxy connect to an arbitrary host.
(CVE-2026-63045)

Hyojae Lee and Zhen Kong discovered that Apache HTTP Server incorrectly
handled certain HTTP requests. A remote attacker could possibly use this
issue to cause a denial of service or execute arbitrary code.
(CVE-2026-63292)

Lucian Nitescu and Zhen Kong discovered that Apache HTTP Server did not
properly handle certain responses from backend servers. A remote attacker
could possibly use this issue to cause a denial of service.
(CVE-2026-63686)

Qing Xu discovered that Apache HTTP Server incorrectly interpreted HTTP
responses from backend servers. A remote attacker could possibly use this
issue to perform HTTP response smuggling attacks. This issue only affected
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS.
(CVE-2026-63718)

Hyojae Lee discovered that Apache HTTP Server did not properly validate
Digest authentication requests. A machine-in-the-middle attacker could
possibly use this issue to bypass authentication. (CVE-2026-73636)

Zhen Kong and Darren Carreras discovered that Apache HTTP Server did not
properly manage authentication requests. A remote attacker could possibly
use this issue to cause a denial of service. (CVE-2026-73637)

Vlatko Kosturjak discovered that Apache HTTP Server did not properly
enforce access restrictions for user directories. A remote attacker could
possibly use this issue to obtain sensitive information. (CVE-2026-79768)

Zhen Kong discovered that Apache HTTP Server did not properly handle
certain WebDAV requests. An authenticated user could possibly use this
issue to cause a denial of service or corrupt WebDAV property data.
(CVE-2026-93546)


Update instructions

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute apache2 –  2.4.66-2ubuntu2.6
apache2-bin –  2.4.66-2ubuntu2.6
apache2-dev –  2.4.66-2ubuntu2.6
apache2-ssl-dev –  2.4.66-2ubuntu2.6
apache2-suexec-custom –  2.4.66-2ubuntu2.6
apache2-suexec-pristine –  2.4.66-2ubuntu2.6
apache2-utils –  2.4.66-2ubuntu2.6
24.04 LTS noble apache2 –  2.4.58-1ubuntu8.17
apache2-bin –  2.4.58-1ubuntu8.17
apache2-dev –  2.4.58-1ubuntu8.17
apache2-ssl-dev –  2.4.58-1ubuntu8.17
apache2-suexec-custom –  2.4.58-1ubuntu8.17
apache2-suexec-pristine –  2.4.58-1ubuntu8.17
apache2-utils –  2.4.58-1ubuntu8.17
libapache2-mod-md –  2.4.58-1ubuntu8.17
libapache2-mod-proxy-uwsgi –  2.4.58-1ubuntu8.17
22.04 LTS jammy apache2 –  2.4.52-1ubuntu4.25
apache2-bin –  2.4.52-1ubuntu4.25
apache2-dev –  2.4.52-1ubuntu4.25
apache2-ssl-dev –  2.4.52-1ubuntu4.25
apache2-suexec-custom –  2.4.52-1ubuntu4.25
apache2-suexec-pristine –  2.4.52-1ubuntu4.25
apache2-utils –  2.4.52-1ubuntu4.25
libapache2-mod-md –  2.4.52-1ubuntu4.25
libapache2-mod-proxy-uwsgi –  2.4.52-1ubuntu4.25
20.04 LTS focal apache2 –  2.4.41-4ubuntu3.23+esm9  
apache2-bin –  2.4.41-4ubuntu3.23+esm9  
apache2-dev –  2.4.41-4ubuntu3.23+esm9  
apache2-ssl-dev –  2.4.41-4ubuntu3.23+esm9  
apache2-suexec-custom –  2.4.41-4ubuntu3.23+esm9  
apache2-suexec-pristine –  2.4.41-4ubuntu3.23+esm9  
apache2-utils –  2.4.41-4ubuntu3.23+esm9  
libapache2-mod-md –  2.4.41-4ubuntu3.23+esm9  
libapache2-mod-proxy-uwsgi –  2.4.41-4ubuntu3.23+esm9  
18.04 LTS bionic apache2 –  2.4.29-1ubuntu4.27+esm13  
apache2-bin –  2.4.29-1ubuntu4.27+esm13  
apache2-dev –  2.4.29-1ubuntu4.27+esm13  
apache2-ssl-dev –  2.4.29-1ubuntu4.27+esm13  
apache2-suexec-custom –  2.4.29-1ubuntu4.27+esm13  
apache2-suexec-pristine –  2.4.29-1ubuntu4.27+esm13  
apache2-utils –  2.4.29-1ubuntu4.27+esm13  
16.04 LTS xenial apache2 –  2.4.18-2ubuntu3.17+esm22  
apache2-bin –  2.4.18-2ubuntu3.17+esm22  
apache2-dev –  2.4.18-2ubuntu3.17+esm22  
apache2-suexec-custom –  2.4.18-2ubuntu3.17+esm22  
apache2-suexec-pristine –  2.4.18-2ubuntu3.17+esm22  
apache2-utils –  2.4.18-2ubuntu3.17+esm22  
14.04 LTS trusty apache2 –  2.4.7-1ubuntu4.22+esm17  
apache2-bin –  2.4.7-1ubuntu4.22+esm17  
apache2-dev –  2.4.7-1ubuntu4.22+esm17  
apache2-mpm-event –  2.4.7-1ubuntu4.22+esm17  
apache2-mpm-itk –  2.4.7-1ubuntu4.22+esm17  
apache2-mpm-prefork –  2.4.7-1ubuntu4.22+esm17  
apache2-mpm-worker –  2.4.7-1ubuntu4.22+esm17  
apache2-suexec –  2.4.7-1ubuntu4.22+esm17  
apache2-suexec-custom –  2.4.7-1ubuntu4.22+esm17  
apache2-suexec-pristine –  2.4.7-1ubuntu4.22+esm17  
apache2-utils –  2.4.7-1ubuntu4.22+esm17  
apache2.2-bin –  2.4.7-1ubuntu4.22+esm17  
libapache2-mod-macro –  1:2.4.7-1ubuntu4.22+esm17  
libapache2-mod-proxy-html –  1:2.4.7-1ubuntu4.22+esm17  

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