USN-8898-1

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. (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 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and Ubuntu 26.04 LTS. (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. (CVE-2026-59797) Update Instructions: Run `sudo pro fix USN-8898-1` to fix the vulnerability. The problem can be corrected by updating your system to the following package versions: apache2 - 2.4.58-1ubuntu8.16 apache2-bin - 2.4.58-1ubuntu8.16 apache2-data - 2.4.58-1ubuntu8.16 apache2-suexec-custom - 2.4.58-1ubuntu8.16 apache2-suexec-pristine - 2.4.58-1ubuntu8.16 apache2-utils - 2.4.58-1ubuntu8.16 libapache2-mod-md - 2.4.58-1ubuntu8.16 libapache2-mod-proxy-uwsgi - 2.4.58-1ubuntu8.16 No subscription required

Upstream Advisory

• View official advisory

Affected Packages

• apache2 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• apache2-bin 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• apache2-data 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• apache2-suexec-custom 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• apache2-suexec-pristine 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• apache2-utils 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• libapache2-mod-md 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• libapache2-mod-proxy-uwsgi 2.4.58-1ubuntu8.16-2.4.58-1ubuntu8.16

• apache2 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• apache2-bin 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• apache2-data 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• apache2-suexec-custom 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• apache2-suexec-pristine 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• apache2-utils 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• libapache2-mod-md 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• libapache2-mod-proxy-uwsgi 2.4.52-1ubuntu4.24-2.4.52-1ubuntu4.24

• apache2 2.4.66-2ubuntu2.5-2.4.66-2ubuntu2.5

• apache2-bin 2.4.66-2ubuntu2.5-2.4.66-2ubuntu2.5

• apache2-data 2.4.66-2ubuntu2.5-2.4.66-2ubuntu2.5

• apache2-suexec-custom 2.4.66-2ubuntu2.5-2.4.66-2ubuntu2.5

• apache2-suexec-pristine 2.4.66-2ubuntu2.5-2.4.66-2ubuntu2.5

• apache2-utils 2.4.66-2ubuntu2.5-2.4.66-2ubuntu2.5

• apache2 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• apache2-bin 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• apache2-data 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• apache2-suexec-custom 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• apache2-suexec-pristine 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• apache2-utils 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• libapache2-mod-md 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8

• libapache2-mod-proxy-uwsgi 2.4.41-4ubuntu3.23+esm8-2.4.41-4ubuntu3.23+esm8