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Ubuntu Apache HTTP Server Critical Denial of Service Vuln 2026-29167

ubuntu
Calendar Grey July 22, 2026
Scroller Ubuntu
Update Apache HTTP Server on Ubuntu to fix multiple security flaws including Denial of Service and code execution risks.
Multiple vulnerabilities in Apache HTTP Server were fixed in various Ubuntu LTS versions, allowing potential denial of service, code execution, and authentication bypass by remote ...

Summary

Several security issues were fixed in Apache HTTP Server.

Software Description:

- apache2: Apache HTTP server

Details:

It was discovered that Apache HTTP Server's mod_ldap module incorrectly

handled memory when processing per-directory configurations. A remote

attacker could possibly use this issue to cause a denial of service or

execute arbitrary code. (CVE-2026-29167)

It was discovered that Apache HTTP Server's mod_proxy_ftp module

incorrectly handled HTML generation for FTP directory listings. A remote

attacker could possibly use this issue to inject arbitrary web script or

HTML. (CVE-2026-29170)

Nitescu Lucian discovered that Apache HTTP Server's mod_auth_digest module

was vulnerable to a timing attack. A remote attacker could possibly use

this issue to bypass Digest authentication. (CVE-2026-33006)

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important arbitrary code apache2

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+esm6
                                  Available with Ubuntu Pro
  apache2-bin                     2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  apache2-dev                     2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  apache2-ssl-dev                 2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  apache2-suexec-custom           2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  apache2-suexec-pristine         2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  apache2-utils                   2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  libapache2-mod-md               2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro
  libapache2-mod-proxy-uwsgi      2.4.41-4ubuntu3.23+esm6
                                  Available with Ubuntu Pro

Ubuntu 18.04 LTS
  apache2                         2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro
  apache2-bin                     2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro
  apache2-dev                     2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro
  apache2-ssl-dev                 2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro
  apache2-suexec-custom           2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro
  apache2-suexec-pristine         2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro
  apache2-utils                   2.4.29-1ubuntu4.27+esm11
                                  Available with Ubuntu Pro

Ubuntu 16.04 LTS
  apache2                         2.4.18-2ubuntu3.17+esm20
                                  Available with Ubuntu Pro
  apache2-bin                     2.4.18-2ubuntu3.17+esm20
                                  Available with Ubuntu Pro
  apache2-dev                     2.4.18-2ubuntu3.17+esm20
                                  Available with Ubuntu Pro
  apache2-suexec-custom           2.4.18-2ubuntu3.17+esm20
                                  Available with Ubuntu Pro
  apache2-suexec-pristine         2.4.18-2ubuntu3.17+esm20
                                  Available with Ubuntu Pro
  apache2-utils                   2.4.18-2ubuntu3.17+esm20
                                  Available with Ubuntu Pro

Ubuntu 14.04 LTS
  apache2                         2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-bin                     2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-dev                     2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-mpm-event               2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-mpm-itk                 2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-mpm-prefork             2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-mpm-worker              2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-suexec                  2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-suexec-custom           2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-suexec-pristine         2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2-utils                   2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  apache2.2-bin                   2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  libapache2-mod-macro            1:2.4.7-1ubuntu4.22+esm15
                                  Available with Ubuntu Pro
  libapache2-mod-proxy-html       1:2.4.7-1ubuntu4.22+esm15
                                  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-8589-1

CVE-2026-29167, CVE-2026-29170, CVE-2026-33006

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8589-1

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important arbitrary code apache2

Package Information

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