========================================================================== Ubuntu Security Notice USN-8495-1 July 02, 2026
nghttp2 vulnerability ========================================================================== 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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