[USN-8398-4] nginx vulnerability

[noreply+usn-bot at canonical.com]

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