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Ubuntu nginx Critical Denial Of Service CVE-2026-49975 Fix USN-8398-3

ubuntu
Calendar Grey June 15, 2026
Dist Ubuntu Esm H88
Update your Ubuntu system to fix nginx’s resource consumption caused by crafted network traffic. Critical patch needed.
nginx could be made to consume excessive resources if it received specially crafted network traffic.

Summary

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.

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu nginx CVE-2026-49975

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

Severity
critical
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8398-3

Topics%20covered

Topics Covered

security advisory denial of service critical Ubuntu nginx 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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