Ubuntu Security Notices USN-8233-2 USN-8233-2: nghttp2 vulnerability Publication date 6 May 2026 Overview nghttp2 could be made to crash if it received specially crafted network traffic. Releases 26.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Related notices Packages 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. 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 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 libnghttp2-14 – 1.68.0-2ubuntu0.1 nghttp2 – 1.68.0-2ubuntu0.1 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. Get Ubuntu Pro References CVE-2026-27135 CVE-2026-27135 Related notices USN-8233-1 USN-8233-1