{
  "cveId": "CVE-2026-81724",
  "url": "https://patchblox.com/security/cve/CVE-2026-81724",
  "summary": "CVE-2026-81724 is fixed in nltk on 1 platform by DEBIAN-CVE-2026-81724 (version 3.10.3-1), released August 28, 2026. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "nltk: NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that allows u...",
  "description": "NLTK before 3.10.3 contains an uncontrolled recursion vulnerability in nltk.featstruct.FeatStructReader that allows unauthenticated attackers to cause a denial of service by supplying deeply nested feature-structure input. Attackers can craft trivial payloads with nested brackets that exceed Python\u0027s recursion limit and raise an unhandled RecursionError, crashing applications that parse user-supplied feature structures or feature grammars.",
  "published": "2026-08-27T17:21:03Z",
  "severity": "",
  "epss": 0.00456,
  "epssPercentile": 0.39842,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "nltk",
      "release": "Debian 14",
      "fixedVersion": "3.10.3-1",
      "fix": "DEBIAN-CVE-2026-81724",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-81724",
      "released": "2026-08-28T00:36:15Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T19:38:12Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}