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[USN-8233-2] nghttp2 vulnerability

Posted on 06 May 2026
Ubuntu Security

==========================================================================Ubuntu Security Notice USN-8233-2
May 06, 2026

nghttp2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:

- Ubuntu 26.04 LTS

Summary:

nghttp2 could be made to crash if it received specially crafted network
traffic.

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

Details:

USN-8233-1 fixed a vulnerability in nghttp2. This update provides the
corresponding update for Ubuntu 26.04 LTS.

Original advisory details:

Andrew MacPherson discovered that nghttp2 did not properly validate
internal state when the session termination API was called. A remote
attacker could possibly use this issue to cause nghttp2 to crash,
resulting in a denial of service.

Update instructions:

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

Ubuntu 26.04 LTS
libnghttp2-14 1.68.0-2ubuntu0.1
nghttp2 1.68.0-2ubuntu0.1

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

References:
https://ubuntu.com/security/notices/USN-8233-2
https://ubuntu.com/security/notices/USN-8233-1
CVE-2026-27135

Package Information:
https://launchpad.net/ubuntu/+source/nghttp2/1.68.0-2ubuntu0.1

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