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[USN-8398-3] nginx vulnerability

Posted on 15 June 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8398-3
June 15, 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 consume excessive resources if it received specially
crafted network traffic.

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

Details:

USN-8398-1 fixed a vulnerability in nginx. The update caused a regression
and was temporarily reverted in USN-8398-2. This update introduces a
complete fix for CVE-2026-49975.

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 1.28.3-2ubuntu1.5
nginx-core 1.28.3-2ubuntu1.5
nginx-extras 1.28.3-2ubuntu1.5
nginx-full 1.28.3-2ubuntu1.5
nginx-light 1.28.3-2ubuntu1.5

Ubuntu 25.10
nginx 1.28.0-6ubuntu1.7
nginx-core 1.28.0-6ubuntu1.7
nginx-extras 1.28.0-6ubuntu1.7
nginx-full 1.28.0-6ubuntu1.7
nginx-light 1.28.0-6ubuntu1.7

Ubuntu 24.04 LTS
nginx 1.24.0-2ubuntu7.12
nginx-core 1.24.0-2ubuntu7.12
nginx-extras 1.24.0-2ubuntu7.12
nginx-full 1.24.0-2ubuntu7.12
nginx-light 1.24.0-2ubuntu7.12

Ubuntu 22.04 LTS
nginx 1.18.0-6ubuntu14.15
nginx-core 1.18.0-6ubuntu14.15
nginx-extras 1.18.0-6ubuntu14.15
nginx-full 1.18.0-6ubuntu14.15
nginx-light 1.18.0-6ubuntu14.15

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

References:
https://ubuntu.com/security/notices/USN-8398-3
https://ubuntu.com/security/notices/USN-8398-2
https://ubuntu.com/security/notices/USN-8398-1
CVE-2026-49975

Package Information:
https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.5
https://launchpad.net/ubuntu/+source/nginx/1.28.0-6ubuntu1.7
https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.12
https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.15

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