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[USN-8398-2] nginx regression

Posted on 09 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8398-2
June 09, 2026

nginx regression
==========================================================================
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:

USN-8398-1 introduced a regression in nginx

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

Details:

USN-8398-1 fixed a vulnerability in nginx. The update introduced a
regression causing nginx to crash when being used with external modules.
This update reverts the fix for CVE-2026-49975 pending further
investigation.

We apologize for the inconvenience.

Original advisory details:

It was discovered that nginx incorrectly handled certain cookie headers in
the HTTP/2 implementation. A remote attacker could possibly use this issue
to cause nginx to consume excessive resources, resulting in a denial of
service.

Update instructions:

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

Ubuntu 26.04 LTS
nginx 1.28.3-2ubuntu1.4
nginx-core 1.28.3-2ubuntu1.4
nginx-extras 1.28.3-2ubuntu1.4
nginx-full 1.28.3-2ubuntu1.4
nginx-light 1.28.3-2ubuntu1.4

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

Ubuntu 24.04 LTS
nginx 1.24.0-2ubuntu7.11
nginx-core 1.24.0-2ubuntu7.11
nginx-extras 1.24.0-2ubuntu7.11
nginx-full 1.24.0-2ubuntu7.11
nginx-light 1.24.0-2ubuntu7.11

Ubuntu 22.04 LTS
nginx 1.18.0-6ubuntu14.14
nginx-core 1.18.0-6ubuntu14.14
nginx-extras 1.18.0-6ubuntu14.14
nginx-full 1.18.0-6ubuntu14.14
nginx-light 1.18.0-6ubuntu14.14

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

References:
https://ubuntu.com/security/notices/USN-8398-2
https://ubuntu.com/security/notices/USN-8398-1
https://launchpad.net/bugs/2155992

Package Information:
https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.4
https://launchpad.net/ubuntu/+source/nginx/1.28.0-6ubuntu1.6
https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.11
https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.14

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