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[USN-8271-1] nginx vulnerability

Posted on 14 May 2026
Ubuntu Security

==========================================================================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

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