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