==========================================================================
Ubuntu Security Notice USN-8271-1
May 14, 2026

nginx vulnerability
==========================================================================

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

- Ubuntu 26.04 LTS
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS

Summary:

nginx could be made to crash or run programs if it received specially
crafted network traffic.

Software Description:
- nginx: small, powerful, scalable web/proxy server

Details:

It was discovered that the nginx ngx_http_rewrite_module component
incorrectly handled certain rewrite directives. A remote attacker could use
this issue to cause nginx to crash, resulting in a denial of service, or
possibly execute arbitrary code.

Update instructions:

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

Ubuntu 26.04 LTS
  nginx                           1.28.3-2ubuntu1.1
  nginx-core                      1.28.3-2ubuntu1.1
  nginx-extras                    1.28.3-2ubuntu1.1
  nginx-full                      1.28.3-2ubuntu1.1
  nginx-light                     1.28.3-2ubuntu1.1

Ubuntu 25.10
  nginx                           1.28.0-6ubuntu1.3
  nginx-core                      1.28.0-6ubuntu1.3
  nginx-extras                    1.28.0-6ubuntu1.3
  nginx-full                      1.28.0-6ubuntu1.3
  nginx-light                     1.28.0-6ubuntu1.3

Ubuntu 24.04 LTS
  nginx                           1.24.0-2ubuntu7.8
  nginx-core                      1.24.0-2ubuntu7.8
  nginx-extras                    1.24.0-2ubuntu7.8
  nginx-full                      1.24.0-2ubuntu7.8
  nginx-light                     1.24.0-2ubuntu7.8

Ubuntu 22.04 LTS
  nginx                           1.18.0-6ubuntu14.11
  nginx-core                      1.18.0-6ubuntu14.11
  nginx-extras                    1.18.0-6ubuntu14.11
  nginx-full                      1.18.0-6ubuntu14.11
  nginx-light                     1.18.0-6ubuntu14.11

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

References:
  https://ubuntu.com/security/notices/USN-8271-1
  CVE-2026-42945

Package Information:
  https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.1
  https://launchpad.net/ubuntu/+source/nginx/1.28.0-6ubuntu1.3
  https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.8
  https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.11