Ubuntu Security Notices USN-8470-1 USN-8470-1: cpp-httplib vulnerability Publication date 25 June 2026 Overview cpp-httplib could mishandle HTTP requests if it received specially crafted network traffic. Releases 26.04 LTS 25.10 24.04 LTS 22.04 LTS Open side navigation Close side navigation Packages Details Update instructions References Packages cpp-httplib - A C++ header-only HTTP/HTTPS server and client library Details It was discovered that cpp-httplib incorrectly percent-decoded HTTP request header values. A remote attacker could use this to inject crafted header content possibly leading to response splitting, log injection or proxy smuggling. It was discovered that cpp-httplib incorrectly percent-decoded HTTP request header values. A remote attacker could use this to inject crafted header content possibly leading to response splitting, log injection or proxy smuggling. 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 libcpp-httplib-dev – 0.26.0+ds-2ubuntu3+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libcpp-httplib0.26 – 0.26.0+ds-2ubuntu3+esm1 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 25.10 questing libcpp-httplib-dev – 0.18.7-1ubuntu0.25.10.2 libcpp-httplib0.18 – 0.18.7-1ubuntu0.25.10.2 24.04 LTS noble libcpp-httplib-dev – 0.14.3+ds-1.1ubuntu0.1~esm2 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libcpp-httplib0.14t64 – 0.14.3+ds-1.1ubuntu0.1~esm2 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 22.04 LTS jammy libcpp-httplib-dev – 0.10.3+ds-1ubuntu0.1~esm2 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. libcpp-httplib0 – 0.10.3+ds-1ubuntu0.1~esm2 Ubuntu Pro Fix available with Ubuntu Pro via ESM Apps. A community fix might become publicly available in the future. 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-2026-45372 CVE-2026-45372