USN-8495-1: nghttp2 vulnerability

Publication date

2 July 2026

Overview

nghttp2 could allow unintended access to network services.


Packages

  • 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.

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

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

Learn more about how to get the fixes.

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

Ubuntu Release Package Version
26.04 LTS resolute nghttp2 –  1.68.0-2ubuntu0.2
25.10 questing nghttp2 –  1.64.0-1.1ubuntu1.2
24.04 LTS noble nghttp2 –  1.59.0-1ubuntu0.4
22.04 LTS jammy nghttp2 –  1.43.0-1ubuntu0.4

Reduce your security exposure

Ubuntu Pro provides ten-year security coverage to 25,000+ packages in Main and Universe repositories, and it is free for up to five machines.


Have additional questions?

Talk to a member of the team ›