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[USN-9016-1] Apache HTTP Server vulnerabilities

Posted on 10 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9016-1
November 10, 2026

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

- Ubuntu 26.10
- 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:

Zhang San, Ankit Prateek, Zhen Kong, SeungHyun Cho, Ryoma Nishioka,
Keita Sode and Hyojae Lee discovered that Apache HTTP Server did not
correctly handle certain memory operations. An attacker could possibly
use this issue to cause a denial of service. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,
Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-46729)

It was discovered that Apache HTTP Server did not correctly handle
certain session cookies. A remote attacker could possibly use this issue
to leak sensitive information. This issue only affected Ubuntu 14.04 LTS,
Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS,
Ubuntu 24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-47360)

Zhen Kong discovered that Apache HTTP Server did not correctly handle
certain forms of authentication. An unauthenticated remote attacker
could possibly use this issue to cause a denial of service. This issue
only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS,
Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS and
Ubuntu 26.04 LTS. (CVE-2026-48005)

Bartlomiej Dmitruk and Masumi Tanaka discovered that Apache HTTP Server
did not correctly handle certain memory operations. An attacker could
possibly use this issue to cause a denial of service or execute
arbitrary code. (CVE-2026-56153)

Lucian Nitescu discovered that Apache HTTP Server did not correctly
handle certain memory operations. An attacker could possibly use this
issue to cause a denial of service or execute arbitrary code. This issue
only affected Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS,
Ubuntu 26.04 LTS and Ubuntu 26.10. (CVE-2026-56449)

It was discovered that Apache HTTP Server's mod_rewrite module incorrectly
handled memory when performing certain variable lookups. A remote attacker
could possibly use this issue to cause a denial of service or execute
arbitrary code. This issue only affected Ubuntu 26.10. (CVE-2026-56154)

Lucian Nitescu, Simon Kappel, and Gianluca Danesin discovered that Apache
HTTP Server's mod_http2 module incorrectly handled memory when processing
certain HTTP/2 connections. A remote attacker could possibly use this issue
to cause a denial of service or execute arbitrary code. This issue only
affected Ubuntu 26.10. (CVE-2026-57941)

Juthawong Naisanguansee, Charles Vosburgh, Mike Read, and Ryoma Nishioka
discovered that Apache HTTP Server's mod_ssl module incorrectly handled
certain expressions. An attacker could possibly use this issue to bypass
intended access restrictions. This issue only affected Ubuntu 26.10.
(CVE-2026-59797)

이지웅 discovered that Apache HTTP Server exposed WebDAV property information.
A remote attacker could possibly use this issue to obtain sensitive
information. This issue only affected Ubuntu 26.10. (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.
This issue only affected Ubuntu 26.10. (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. This issue
only affected Ubuntu 26.10. (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. This issue
only affected Ubuntu 26.10. (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 26.10. (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. This issue only
affected Ubuntu 26.10. (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. This issue only affected
Ubuntu 26.10. (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. This issue only
affected Ubuntu 26.10. (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. This
issue only affected Ubuntu 26.10. (CVE-2026-93546)

Update instructions:

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

Ubuntu 26.10
apache2 2.4.68-1ubuntu6.1
apache2-dev 2.4.68-1ubuntu6.1

Ubuntu 26.04 LTS
apache2 2.4.66-2ubuntu2.7
apache2-dev 2.4.66-2ubuntu2.7

Ubuntu 24.04 LTS
apache2 2.4.58-1ubuntu8.18
apache2-dev 2.4.58-1ubuntu8.18

Ubuntu 22.04 LTS
apache2 2.4.52-1ubuntu4.26
apache2-dev 2.4.52-1ubuntu4.26

Ubuntu 20.04 LTS
apache2 2.4.41-4ubuntu3.23+esm10
Available with Ubuntu Pro
apache2-dev 2.4.41-4ubuntu3.23+esm10
Available with Ubuntu Pro

Ubuntu 18.04 LTS
apache2 2.4.29-1ubuntu4.27+esm14
Available with Ubuntu Pro
apache2-dev 2.4.29-1ubuntu4.27+esm14
Available with Ubuntu Pro

Ubuntu 16.04 LTS
apache2 2.4.18-2ubuntu3.17+esm23
Available with Ubuntu Pro
apache2-dev 2.4.18-2ubuntu3.17+esm23
Available with Ubuntu Pro

Ubuntu 14.04 LTS
apache2 2.4.7-1ubuntu4.22+esm18
Available with Ubuntu Pro
apache2-dev 2.4.7-1ubuntu4.22+esm18
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-9016-1
CVE-2026-46729, CVE-2026-47360, CVE-2026-48005, CVE-2026-56153,
CVE-2026-56154, CVE-2026-56449, CVE-2026-57941, CVE-2026-58415,
CVE-2026-59797, 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/apache2/2.4.68-1ubuntu6.1
https://launchpad.net/ubuntu/+source/apache2/2.4.66-2ubuntu2.7
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.18
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.26

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