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[USN-9090-1] Apache HTTP Server vulnerabilities

Posted on 12 November 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-9090-1
November 12, 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:

Zhenpeng Lin discovered that Apache HTTP Server's mod_dav module
incorrectly calculated memory sizes when handling WebDAV locks. An attacker
with permission to create WebDAV locks could possibly use this issue to
cause Apache HTTP Server to crash, resulting in a denial of service.
(CVE-2026-42528)

It was discovered that Apache HTTP Server's mod_vhost_alias module
incorrectly handled certain requests, leading to a one-byte stack buffer
overflow. A remote attacker could possibly use this issue to cause Apache
HTTP Server to crash, resulting in a denial of service, or possibly execute
arbitrary code. (CVE-2026-109163)

It was discovered that Apache HTTP Server's mod_md module incorrectly
handled certain conditions, leading to a NULL pointer dereference. An
attacker could possibly use this issue to cause Apache HTTP Server to
crash, resulting in a denial of service. 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-2026-106023)

It was discovered that Apache HTTP Server's mod_http2 module incorrectly
handled certain request headers, leading to heap corruption. A remote
attacker could possibly use this issue to cause Apache HTTP Server to
crash, resulting in a denial of service, or possibly 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-2026-119618)

Feliks Penconek, Yang Song, and JiaSheng He discovered that Apache HTTP
Server could treat the target of some internal redirects from CGI programs
as a CGI program. A remote attacker could possibly use this issue to
execute arbitrary code. This issue only affected Ubuntu 26.04 LTS and
Ubuntu 26.10. (CVE-2026-42356)

Update instructions:

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

Ubuntu 26.10
apache2 2.4.68-1ubuntu6.2
apache2-bin 2.4.68-1ubuntu6.2
apache2-dev 2.4.68-1ubuntu6.2

Ubuntu 26.04 LTS
apache2 2.4.66-2ubuntu2.8
apache2-bin 2.4.66-2ubuntu2.8
apache2-dev 2.4.66-2ubuntu2.8

Ubuntu 24.04 LTS
apache2 2.4.58-1ubuntu8.19
apache2-bin 2.4.58-1ubuntu8.19
apache2-dev 2.4.58-1ubuntu8.19

Ubuntu 22.04 LTS
apache2 2.4.52-1ubuntu4.27
apache2-bin 2.4.52-1ubuntu4.27
apache2-dev 2.4.52-1ubuntu4.27

Ubuntu 20.04 LTS
apache2 2.4.41-4ubuntu3.23+esm11
Available with Ubuntu Pro
apache2-bin 2.4.41-4ubuntu3.23+esm11
Available with Ubuntu Pro
apache2-dev 2.4.41-4ubuntu3.23+esm11
Available with Ubuntu Pro

Ubuntu 18.04 LTS
apache2 2.4.29-1ubuntu4.27+esm15
Available with Ubuntu Pro
apache2-bin 2.4.29-1ubuntu4.27+esm15
Available with Ubuntu Pro
apache2-dev 2.4.29-1ubuntu4.27+esm15
Available with Ubuntu Pro

Ubuntu 16.04 LTS
apache2 2.4.18-2ubuntu3.17+esm24
Available with Ubuntu Pro
apache2-bin 2.4.18-2ubuntu3.17+esm24
Available with Ubuntu Pro
apache2-dev 2.4.18-2ubuntu3.17+esm24
Available with Ubuntu Pro

Ubuntu 14.04 LTS
apache2 2.4.7-1ubuntu4.22+esm19
Available with Ubuntu Pro
apache2-bin 2.4.7-1ubuntu4.22+esm19
Available with Ubuntu Pro
apache2-dev 2.4.7-1ubuntu4.22+esm19
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-9090-1
CVE-2026-106023, CVE-2026-109163, CVE-2026-119618, CVE-2026-42356,
CVE-2026-42528

Package Information:
https://launchpad.net/ubuntu/+source/apache2/2.4.68-1ubuntu6.2
https://launchpad.net/ubuntu/+source/apache2/2.4.66-2ubuntu2.8
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.19
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.27

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