{
  "cveId": "CVE-2026-45372",
  "url": "https://patchblox.com/security/cve/CVE-2026-45372",
  "summary": "CVE-2026-45372 is fixed in 6 products on 1 platform, first by libcpp-httplib0.26 0.26.0\u002Bds-2ubuntu3\u002Besm1, released May 29, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "libcpp-httplib0: 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 0.44.0, when cpp-httplib\u0027s server parses an incoming request, it applies percent-decoding to every header value except Location and Referer. The validity check (is_field_value) is run before decoding, so encoded %0D%0A passes the check and is then expanded to a literal \\r\\n byte pair inside the stored header value. This vulnerability is fixed in 0.44.0.",
  "published": "2026-05-29T13:16:00Z",
  "severity": "Medium",
  "epss": 0.00295,
  "epssPercentile": 0.22247,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "cpp-httplib",
      "release": "Fedora 43",
      "fixedVersion": "0.48.0-1.fc43",
      "fix": "FEDORA-2026-1D4BD0354A",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-1d4bd0354a",
      "released": "2026-06-24T13:16:30Z"
    },
    {
      "platform": "linux",
      "product": "cpp-httplib-devel",
      "release": "Fedora 43",
      "fixedVersion": "0.48.0-1.fc43",
      "fix": "FEDORA-2026-1D4BD0354A",
      "url": "https://patchblox.com/security/fix/linux/fedora-2026-1d4bd0354a",
      "released": "2026-06-24T13:16:30Z"
    },
    {
      "platform": "linux",
      "product": "libcpp-httplib0",
      "release": "Ubuntu 22.04.1 LTS (jammy)",
      "fixedVersion": "0.10.3\u002Bds-1ubuntu0.1~esm2",
      "fix": "libcpp-httplib0 0.10.3\u002Bds-1ubuntu0.1~esm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-jammy-libcpp-httplib0-0.10.3-ds-1ubuntu0.1-esm2",
      "released": "2026-06-26T17:32:42Z"
    },
    {
      "platform": "linux",
      "product": "libcpp-httplib0.14t64",
      "release": "Ubuntu 24.04.5 LTS (noble)",
      "fixedVersion": "0.14.3\u002Bds-1.1ubuntu0.1~esm2",
      "fix": "libcpp-httplib0.14t64 0.14.3\u002Bds-1.1ubuntu0.1~esm2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-noble-libcpp-httplib0.14t64-0.14.3-ds-1.1ubuntu0.1-esm2",
      "released": "2026-06-26T17:32:44Z"
    },
    {
      "platform": "linux",
      "product": "libcpp-httplib0.18",
      "release": "Ubuntu 25.10 (questing)",
      "fixedVersion": "0.18.7-1ubuntu0.25.10.2",
      "fix": "libcpp-httplib0.18 0.18.7-1ubuntu0.25.10.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-questing-libcpp-httplib0.18-0.18.7-1ubuntu0.25.10.2",
      "released": "2026-06-26T17:32:48Z"
    },
    {
      "platform": "linux",
      "product": "libcpp-httplib0.26",
      "release": "Ubuntu 26.04.1 LTS (resolute)",
      "fixedVersion": "0.26.0\u002Bds-2ubuntu3\u002Besm1",
      "fix": "libcpp-httplib0.26 0.26.0\u002Bds-2ubuntu3\u002Besm1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-resolute-libcpp-httplib0.26-0.26.0-ds-2ubuntu3-esm1",
      "released": "2026-05-29T13:16:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}