{
  "cveId": "CVE-2026-16221",
  "url": "https://patchblox.com/security/cve/CVE-2026-16221",
  "summary": "CVE-2026-16221 is fixed in node-ajv on 1 platform by DEBIAN-CVE-2026-16221 (version 8.20.0~ds\u002B~cs7.1.2-1), released August 6, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "node-ajv: Impact: fast-uri versions from 2.3.1 through 4.1.0 (including the 3.x line up to 3.1.3 and the 2.x line up to 2.4.2)...",
  "description": "Impact: fast-uri versions from 2.3.1 through 4.1.0 (including the 3.x line up to 3.1.3 and the 2.x line up to 2.4.2) do not treat a literal backslash character (U\u002B005C) as an authority delimiter. Node\u0027s native WHATWG URL parser, used by fetch, undici, and Node\u0027s http and https clients, normalizes the backslash to a forward slash for special schemes such as http, https, ws, wss, ftp, and file. As a result, the two parsers extract different hosts from the same input string. Applications that use fast-uri to enforce host-based policy such as allowlists, denylists, loopback or SSRF filtering, redirect validation, or outbound proxy routing before passing the same URL into Node\u0027s URL or fetch consumers can be steered to an unintended destination, including cloud metadata endpoints, loopback, or internal hosts.   Patches: upgrade to fast-uri 4.1.1, 3.1.4, or 2.4.3.  Workarounds: none.",
  "published": "2026-07-19T15:16:49Z",
  "severity": "high",
  "cvss": 7.5,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
  "epss": 0.00436,
  "epssPercentile": 0.38084,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "node-ajv",
      "release": "Debian 14",
      "fixedVersion": "8.20.0~ds\u002B~cs7.1.2-1",
      "fix": "DEBIAN-CVE-2026-16221",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-16221",
      "released": "2026-08-06T15:13:07Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}