{
  "cveId": "CVE-2026-31870",
  "url": "https://patchblox.com/security/cve/CVE-2026-31870",
  "summary": "CVE-2026-31870 is fixed in cpp-httplib on 1 platform by DEBIAN-CVE-2026-31870 (version 0.41.0\u002Bds-3), released March 11, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "cpp-httplib: cpp-httplib is a C\u002B\u002B11 single-file header-only cross platform HTTP/HTTPS library",
  "description": "cpp-httplib is a C\u002B\u002B11 single-file header-only cross platform HTTP/HTTPS library. Prior to 0.37.1, when a cpp-httplib client uses the streaming API (httplib::stream::Get, httplib::stream::Post, etc.), the library calls std::stoull() directly on the Content-Length header value received from the server with no input validation and no exception handling. std::stoull throws std::invalid_argument for non-numeric strings and std::out_of_range for values exceeding ULLONG_MAX. Since nothing catches these exceptions, the C\u002B\u002B runtime calls std::terminate(), which kills the process with SIGABRT. Any server the client connects to \u2014 including servers reached via HTTP redirects, third-party APIs, or man-in-the-middle positions can crash the client application with a single HTTP response. No authentication is required. No interaction from the end user is required. The crash is deterministic and immediate. This vulnerability is fixed in 0.37.1.",
  "published": "2026-03-11T18:16:26Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss": 0.00516,
  "epssPercentile": 0.44184,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "cpp-httplib",
      "release": "Debian 14",
      "fixedVersion": "0.41.0\u002Bds-3",
      "fix": "DEBIAN-CVE-2026-31870",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-31870",
      "released": "2026-03-11T18:16:26Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T13:31:49Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}