Ubuntu Nginx Critical Denial of Service Vulnerability USN-8458-1 CVE-2026

ubuntu

June 22, 2026

Several security issues were fixed in nginx.

Summary

Several security issues were fixed in nginx.

Software Description:

- nginx: small, powerful, scalable web/proxy server

Details:

It was discovered that nginx incorrectly handled large headers when

proxying HTTP/2 traffic. A remote attacker could use this issue to cause

nginx to crash, resulting in a denial of service, or possibly execute

arbitrary code. The default compiler options for affected releases should

reduce the vulnerability to a denial of service. (CVE-2026-42055)

It was discovered that nginx incorrectly handled character set conversion

under certain circumstances. A remote attacker could possibly use this

issue to obtain sensitive information or cause nginx to crash, resulting in

a denial of service. (CVE-2026-48142)

Topics Covered

security advisory denial of service critical remote access Ubuntu nginx

Update Instructions

The problem can be corrected by updating your system to the following
package versions:

Ubuntu 26.04 LTS
  nginx                           1.28.3-2ubuntu1.6
  nginx-core                      1.28.3-2ubuntu1.6
  nginx-extras                    1.28.3-2ubuntu1.6
  nginx-full                      1.28.3-2ubuntu1.6
  nginx-light                     1.28.3-2ubuntu1.6

Ubuntu 25.10
  nginx                           1.28.0-6ubuntu1.8
  nginx-core                      1.28.0-6ubuntu1.8
  nginx-extras                    1.28.0-6ubuntu1.8
  nginx-full                      1.28.0-6ubuntu1.8
  nginx-light                     1.28.0-6ubuntu1.8

Ubuntu 24.04 LTS
  nginx                           1.24.0-2ubuntu7.13
  nginx-core                      1.24.0-2ubuntu7.13
  nginx-extras                    1.24.0-2ubuntu7.13
  nginx-full                      1.24.0-2ubuntu7.13
  nginx-light                     1.24.0-2ubuntu7.13

Ubuntu 22.04 LTS
  nginx                           1.18.0-6ubuntu14.16
  nginx-core                      1.18.0-6ubuntu14.16
  nginx-extras                    1.18.0-6ubuntu14.16
  nginx-full                      1.18.0-6ubuntu14.16
  nginx-light                     1.18.0-6ubuntu14.16

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