========================================================================== Ubuntu Security Notice USN-8233-1 May 05, 2026
nghttp2 vulnerability
==========================================================================
A security issue affects these releases of Ubuntu and its derivatives:
- Ubuntu 25.10
- Ubuntu 24.04 LTS
- Ubuntu 22.04 LTS
- Ubuntu 20.04 LTS
- Ubuntu 18.04 LTS
- Ubuntu 16.04 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:
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 25.10
libnghttp2-14 1.64.0-1.1ubuntu1.1
nghttp2 1.64.0-1.1ubuntu1.1
Ubuntu 24.04 LTS
libnghttp2-14 1.59.0-1ubuntu0.3
nghttp2 1.59.0-1ubuntu0.3
Ubuntu 22.04 LTS
libnghttp2-14 1.43.0-1ubuntu0.3
nghttp2 1.43.0-1ubuntu0.3
Ubuntu 20.04 LTS
libnghttp2-14 1.40.0-1ubuntu0.3+esm1
Available with Ubuntu Pro
nghttp2 1.40.0-1ubuntu0.3+esm1
Available with Ubuntu Pro
Ubuntu 18.04 LTS
libnghttp2-14 1.30.0-1ubuntu1+esm3
Available with Ubuntu Pro
nghttp2 1.30.0-1ubuntu1+esm3
Available with Ubuntu Pro
Ubuntu 16.04 LTS
libnghttp2-14 1.7.1-1ubuntu0.1~esm3
Available with Ubuntu Pro
nghttp2 1.7.1-1ubuntu0.1~esm3
Available with Ubuntu Pro
In general, a standard system update will make all the necessary
changes.
References:
https://ubuntu.com/security/notices/USN-8233-1
CVE-2026-27135
Package Information:
https://launchpad.net/ubuntu/+source/nghttp2/1.64.0-1.1ubuntu1.1
https://launchpad.net/ubuntu/+source/nghttp2/1.59.0-1ubuntu0.3
https://launchpad.net/ubuntu/+source/nghttp2/1.43.0-1ubuntu0.3
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