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