Home / mailings [USN-8931-1] Apache HTTP Server vulnerabilities
Posted on 14 October 2026
Ubuntu Security==========================================================================Ubuntu Security Notice USN-8931-1
October 14, 2026
apache2 vulnerabilities
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 26.04 LTS
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- 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:
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:
The problem can be corrected by updating your system to the following
package versions:
Ubuntu 26.04 LTS
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
Ubuntu 24.04 LTS
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
Ubuntu 22.04 LTS
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
Ubuntu 20.04 LTS
apache2 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
apache2-bin 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
apache2-dev 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
apache2-ssl-dev 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
apache2-suexec-custom 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
apache2-suexec-pristine 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
apache2-utils 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
libapache2-mod-md 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
libapache2-mod-proxy-uwsgi 2.4.41-4ubuntu3.23+esm9
Available with Ubuntu Pro
Ubuntu 18.04 LTS
apache2 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
apache2-bin 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
apache2-dev 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
apache2-ssl-dev 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
apache2-suexec-custom 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
apache2-suexec-pristine 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
apache2-utils 2.4.29-1ubuntu4.27+esm13
Available with Ubuntu Pro
Ubuntu 16.04 LTS
apache2 2.4.18-2ubuntu3.17+esm22
Available with Ubuntu Pro
apache2-bin 2.4.18-2ubuntu3.17+esm22
Available with Ubuntu Pro
apache2-dev 2.4.18-2ubuntu3.17+esm22
Available with Ubuntu Pro
apache2-suexec-custom 2.4.18-2ubuntu3.17+esm22
Available with Ubuntu Pro
apache2-suexec-pristine 2.4.18-2ubuntu3.17+esm22
Available with Ubuntu Pro
apache2-utils 2.4.18-2ubuntu3.17+esm22
Available with Ubuntu Pro
Ubuntu 14.04 LTS
apache2 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-bin 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-dev 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-mpm-event 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-mpm-itk 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-mpm-prefork 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-mpm-worker 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-suexec 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-suexec-custom 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-suexec-pristine 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2-utils 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
apache2.2-bin 2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
libapache2-mod-macro 1:2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
libapache2-mod-proxy-html 1:2.4.7-1ubuntu4.22+esm17
Available with Ubuntu Pro
In general, a standard system update will make all the necessary changes.
References:
https://ubuntu.com/security/notices/USN-8931-1
CVE-2026-58415, CVE-2026-63045, CVE-2026-63292, CVE-2026-63686,
CVE-2026-63718, CVE-2026-73636, CVE-2026-73637, CVE-2026-79768,
CVE-2026-93546
Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.66-2ubuntu2.6
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.17
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.25
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