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[USN-8495-1] nghttp2 vulnerability

Posted on 02 July 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8495-1
July 02, 2026

nghttp2 vulnerability
==========================================================================
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:

nghttp2 could allow unintended access to network services.

Software Description:
- nghttp2: HTTP/2 C Library and tools

Details:

It was discovered that the nghttp2 nghttpx proxy incorrectly handled
HTTP/1.1 Upgrade requests that included a Content-Length header and body.
A remote attacker could possibly use this issue to perform HTTP request and
response smuggling attacks against backend services.

Update instructions:

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

Ubuntu 26.04 LTS
nghttp2 1.68.0-2ubuntu0.2

Ubuntu 25.10
nghttp2 1.64.0-1.1ubuntu1.2

Ubuntu 24.04 LTS
nghttp2 1.59.0-1ubuntu0.4

Ubuntu 22.04 LTS
nghttp2 1.43.0-1ubuntu0.4

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

References:
https://ubuntu.com/security/notices/USN-8495-1
CVE-2026-58055

Package Information:
https://launchpad.net/ubuntu/+source/nghttp2/1.68.0-2ubuntu0.2
https://launchpad.net/ubuntu/+source/nghttp2/1.64.0-1.1ubuntu1.2
https://launchpad.net/ubuntu/+source/nghttp2/1.59.0-1ubuntu0.4
https://launchpad.net/ubuntu/+source/nghttp2/1.43.0-1ubuntu0.4

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