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Ubuntu 20.04 LTS nginx Important Resource Consumption Issue USN-8398-4

ubuntu
Calendar Grey July 2, 2026
Dist Ubuntu Esm H88
Update your Ubuntu system as nginx has a fix for a critical resource consumption issue. Protect against DoS attacks.
nginx could be made to consume excessive resources if it received specially crafted network traffic.

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.

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important nginx resource consumption

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

Severity
important
Lowest
Low
Medium
High
Critical

Ubuntu Security Notice USN-8398-4

Topics%20covered

Topics Covered

security advisory denial of service Ubuntu important nginx resource consumption

Package Information

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