{"id":"CVE-2026-103930","published":"2026-10-14T19:17:07.657","lastModified":"2026-10-16T20:04:29.760","description":"cpp-httplib is a C++ header-only HTTP/HTTPS library. From 0.29.0 until 0.51.0, Client::open_stream in httplib.h accepts a caller-controlled path that reaches detail::write_request_line() without the detail::encode_path() protection used by the ordinary buffered request path. Raw carriage-return and line-feed bytes in the path can therefore split the outbound HTTP/1.1 request line and inject attacker-shaped request metadata. Exploitation requires an embedding application to pass remote user input into the open_stream path and a backend or intermediary that interprets the injected bytes; the established impact is modification of backend-visible request data, not direct confidentiality or availability impact. This issue is fixed in version 0.51.0.","cvssScore":3.7,"cvssSeverity":"LOW","cvssVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","cwes":["CWE-113"],"vendors":[],"products":[],"references":[{"url":"https://github.com/yhirose/cpp-httplib/commit/255c075b82cf9f221e6e607e8e6789e6e2bf4c2a","tags":[]},{"url":"https://github.com/yhirose/cpp-httplib/pull/2501","tags":[]},{"url":"https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0","tags":[]},{"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-vq69-f637-8fhr","tags":[]}],"exploitRefs":[{"url":"https://github.com/yhirose/cpp-httplib/commit/255c075b82cf9f221e6e607e8e6789e6e2bf4c2a","tags":[]},{"url":"https://github.com/yhirose/cpp-httplib/pull/2501","tags":[]},{"url":"https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0","tags":[]},{"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-vq69-f637-8fhr","tags":[]}],"hasPoc":true,"ai":null}