[USN-8458-1] nginx vulnerabilities

[noreply+usn-bot at canonical.com]

==========================================================================
Ubuntu Security Notice USN-8458-1
June 22, 2026

nginx vulnerabilities
==========================================================================

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:

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)

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.

References:
  https://ubuntu.com/security/notices/USN-8458-1
  CVE-2026-42055, CVE-2026-48142

Package Information:
  https://launchpad.net/ubuntu/+source/nginx/1.28.3-2ubuntu1.6
  https://launchpad.net/ubuntu/+source/nginx/1.28.0-6ubuntu1.8
  https://launchpad.net/ubuntu/+source/nginx/1.24.0-2ubuntu7.13
  https://launchpad.net/ubuntu/+source/nginx/1.18.0-6ubuntu14.16
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