{
  "cveId": "CVE-2026-4867",
  "url": "https://patchblox.com/security/cve/CVE-2026-4867",
  "summary": "CVE-2026-4867 is fixed in node-path-to-regexp on 1 platform, first by DEBIAN-CVE-2026-4867, released March 26, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "node-path-to-regexp: Impact:  A bad regular expression is generated any time you have three or more parameters within a single segment, se...",
  "description": "Impact:  A bad regular expression is generated any time you have three or more parameters within a single segment, separated by something that is not a period (.). For example, /:a-:b-:c or /:a-:b-:c-:d. The backtrack protection added in path-to-regexp@0.1.12 only prevents ambiguity for two parameters. With three or more, the generated lookahead does not block single separator characters, so capture groups overlap and cause catastrophic backtracking.  Patches:  Upgrade to path-to-regexp@0.1.13  Custom regex patterns in route definitions (e.g., /:a-:b([^-/]\u002B)-:c([^-/]\u002B)) are not affected because they override the default capture group.  Workarounds:  All versions can be patched by providing a custom regular expression for parameters after the first in a single segment. As long as the custom regular expression does not match the text before the parameter, you will be safe. For example, change /:a-:b-:c to /:a-:b([^-/]\u002B)-:c([^-/]\u002B).  If paths cannot be rewritten and versions cannot be upgraded, another alternative is to limit the URL length.",
  "published": "2026-03-26T17:16:42Z",
  "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": 0.00515,
  "epssPercentile": 0.44131,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "node-path-to-regexp",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "1.0.1-1",
      "fix": "DEBIAN-CVE-2026-4867",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-4867",
      "released": "2026-03-26T17:16:42Z"
    },
    {
      "platform": "linux",
      "product": "node-path-to-regexp",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "1.0.1-1",
      "fix": "DEBIAN-CVE-2026-4867",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-4867",
      "released": "2026-03-26T17:16:42Z"
    },
    {
      "platform": "linux",
      "product": "node-path-to-regexp",
      "release": "Debian 14",
      "fixedVersion": "1.0.1-1",
      "fix": "DEBIAN-CVE-2026-4867",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-4867",
      "released": "2026-03-26T17:16:42Z"
    }
  ],
  "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"
  }
}