[USN-8233-1] nghttp2 vulnerability

========================================================================== 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