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Ubuntu Apache2 Critical Denial of Service Threats USN-8516-1

ubuntu
Calendar Grey July 8, 2026
Dist Ubuntu Esm H88
Numerous security issues in Apache HTTP Server require updates in Ubuntu LTS for protection against potential threats.
Several security issues were fixed in Apache HTTP Server.

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. An attacker

could use this issue to cause the server to crash, resulting in a denial of

service, or possibly 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)

It was discovered that Apache HTTP Server's mod_proxy_html module

incorrectly handled certain content from an untrusted backend. A remote

attacker could possibly use this issue to cause Apache HTTP Server to

crash, resulting in a denial of service. (CVE-2026-34355)

It was discovered that Apache HTTP Server incorrectly handled

ProxyPassReverseCookie dir...

Read the Full Advisory

Topics%20covered

Topics Covered

security advisory denial of service critical remote attack Ubuntu apache2

Update Instructions

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

Ubuntu 26.04 LTS
  apache2                         2.4.66-2ubuntu2.4

Ubuntu 24.04 LTS
  apache2                         2.4.58-1ubuntu8.15

Ubuntu 22.04 LTS
  apache2                         2.4.52-1ubuntu4.23

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

References

https://ubuntu.com/security/notices/USN-8516-1

CVE-2026-29167, CVE-2026-29170, CVE-2026-34355, CVE-2026-34356,

CVE-2026-42535, CVE-2026-42536, CVE-2026-43951, CVE-2026-44119,

CVE-2026-44185, CVE-2026-44186, CVE-2026-44631, CVE-2026-48913

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8516-1

Topics%20covered

Topics Covered

security advisory denial of service critical remote attack Ubuntu apache2

Package Information

https://launchpad.net/ubuntu/+source/apache2/2.4.66-2ubuntu2.4
https://launchpad.net/ubuntu/+source/apache2/2.4.58-1ubuntu8.15
https://launchpad.net/ubuntu/+source/apache2/2.4.52-1ubuntu4.23

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