{"id":"CVE-2026-103930","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-103930","generatedAt":"2026-10-28T05:59:55.828Z","title":"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.","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.","published":"2026-10-14T19:17:08.000Z","lastModified":"2026-10-16T20:04:30.000Z","status":"Deferred","sourceIdentifier":"security-advisories@github.com","cvss":{"version":"3.1","score":3.7,"severity":"LOW","vector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N"},"cwe":["CWE-113"],"affected":[],"epss":{"score":0.00366,"percentile":0.30293,"date":"2026-10-27","history":[{"date":"2026-10-15","score":0.00366,"percentile":0.28808}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"low","text":"Lower severity and a low EPSS score (0.37%). Track it; it rarely justifies an emergency change on its own."},"changes":[{"kind":"new","label":"New CVE","at":"2026-10-14T19:17:08.000Z","detail":{"score":"3.7","severity":"LOW","publishedAt":"2026-10-14T19:17:07.657Z"},"summary":"New CVE, low severity (CVSS 3.7)."}],"references":[{"url":"https://github.com/yhirose/cpp-httplib/commit/255c075b82cf9f221e6e607e8e6789e6e2bf4c2a","source":"security-advisories@github.com"},{"url":"https://github.com/yhirose/cpp-httplib/pull/2501","source":"security-advisories@github.com"},{"url":"https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0","source":"security-advisories@github.com"},{"url":"https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-vq69-f637-8fhr","source":"security-advisories@github.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-103930","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}