[USN-8495-1] nghttp2 vulnerability

[noreply+usn-bot at canonical.com]

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

nghttp2 vulnerability
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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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