{"id":"CVE-2026-34441","title":"cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library","summary":"cpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the r…","severity":"medium","cvss":4.8,"cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N","cwe":["CWE-444"],"vendor":"yhirose","product":"cpp-httplib","affected":["cpp-httplib < 0.40.0"],"patched":["cpp-httplib 0.40.0"],"published":"2026-03-31","updated":"2026-07-24","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-34441","references":[{"url":"https://github.com/yhirose/cpp-httplib/releases/tag/v0.40.0","label":"security-advisories@github.com"},{"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-jv63-rm9j-6jwc","label":"security-advisories@github.com"}],"tags":["nvd"],"epss":0.00196,"epssPercentile":0.09555,"ingestedAt":"2026-07-25T21:03:57.929Z","slug":"CVE-2026-34441","body":"## Overview\n\ncpp-httplib is a C++11 single-file header-only cross platform HTTP/HTTPS library. Prior to version 0.40.0, cpp-httplib is vulnerable to HTTP Request Smuggling. The server's static file handler serves GET responses without consuming the request body. On HTTP/1.1 keep-alive connections, the unread body bytes remain on the TCP stream and are interpreted as the start of a new HTTP request. An attacker can embed an arbitrary HTTP request inside the body of a GET request, which the server processes as a separate request. This issue has been patched in version 0.40.0.\n\n## Affected\n\n- `cpp-httplib < 0.40.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `cpp-httplib 0.40.0`","depth":"sunlit","depthScore":26,"depthScoreParts":{"impact":26.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}