{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0.29.0"
              },
              {
                "fixed": "0.51.0"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "5304464a53f793f8e3e4777ea5941d60cf8c91e3"
            },
            {
              "fixed": "255c075b82cf9f221e6e607e8e6789e6e2bf4c2a"
            },
            {
              "fixed": "d66d9a95997d51a8ba9822a611d1267757741535"
            }
          ],
          "repo": "https://github.com/yhirose/cpp-httplib",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-vq69-f637-8fhr"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-113"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103930.json"
  },
  "details": "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.",
  "id": "CVE-2026-103930",
  "modified": "2026-10-17T02:30:44.019870027Z",
  "published": "2026-10-14T18:19:38.256Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/yhirose/cpp-httplib/releases/tag/v0.51.0"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103930.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/yhirose/cpp-httplib/security/advisories/GHSA-vq69-f637-8fhr"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103930"
    },
    {
      "type": "FIX",
      "url": "https://github.com/yhirose/cpp-httplib/commit/255c075b82cf9f221e6e607e8e6789e6e2bf4c2a"
    },
    {
      "type": "FIX",
      "url": "https://github.com/yhirose/cpp-httplib/pull/2501"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "cpp-httplib open_stream serializes CRLF in request target into HTTP request line"
}