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[USN-8398-4] nginx vulnerability

Posted on 02 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8398-4
July 02, 2026

nginx vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 LTS
- Ubuntu 14.04 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-8398-3 fixed a vulnerability in nginx. This update provides the
corresponding fix for Ubuntu 14.04 LTS, Ubuntu 16.04 LTS, Ubuntu
18.04 LTS, and Ubuntu 20.04 LTS.

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 20.04 LTS
nginx 1.18.0-0ubuntu1.7+esm3
Available with Ubuntu Pro
nginx-common 1.18.0-0ubuntu1.7+esm3
Available with Ubuntu Pro
nginx-core 1.18.0-0ubuntu1.7+esm3
Available with Ubuntu Pro
nginx-extras 1.18.0-0ubuntu1.7+esm3
Available with Ubuntu Pro
nginx-full 1.18.0-0ubuntu1.7+esm3
Available with Ubuntu Pro
nginx-light 1.18.0-0ubuntu1.7+esm3
Available with Ubuntu Pro

Ubuntu 18.04 LTS
nginx 1.14.0-0ubuntu1.11+esm4
Available with Ubuntu Pro
nginx-core 1.14.0-0ubuntu1.11+esm4
Available with Ubuntu Pro
nginx-extras 1.14.0-0ubuntu1.11+esm4
Available with Ubuntu Pro
nginx-full 1.14.0-0ubuntu1.11+esm4
Available with Ubuntu Pro
nginx-light 1.14.0-0ubuntu1.11+esm4
Available with Ubuntu Pro

Ubuntu 16.04 LTS
nginx 1.10.3-0ubuntu0.16.04.5+esm9
Available with Ubuntu Pro
nginx-common 1.10.3-0ubuntu0.16.04.5+esm9
Available with Ubuntu Pro
nginx-core 1.10.3-0ubuntu0.16.04.5+esm9
Available with Ubuntu Pro
nginx-extras 1.10.3-0ubuntu0.16.04.5+esm9
Available with Ubuntu Pro
nginx-full 1.10.3-0ubuntu0.16.04.5+esm9
Available with Ubuntu Pro
nginx-light 1.10.3-0ubuntu0.16.04.5+esm9
Available with Ubuntu Pro

Ubuntu 14.04 LTS
nginx 1.4.6-1ubuntu3.9+esm8
Available with Ubuntu Pro
nginx-common 1.4.6-1ubuntu3.9+esm8
Available with Ubuntu Pro
nginx-core 1.4.6-1ubuntu3.9+esm8
Available with Ubuntu Pro
nginx-extras 1.4.6-1ubuntu3.9+esm8
Available with Ubuntu Pro
nginx-full 1.4.6-1ubuntu3.9+esm8
Available with Ubuntu Pro
nginx-light 1.4.6-1ubuntu3.9+esm8
Available with Ubuntu Pro

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

References:
https://ubuntu.com/security/notices/USN-8398-4
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

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