CVE-2026-126297

{
  "etk_id": "ETK-2026-4439",
  "cve_id": "CVE-2026-126297",
  "display_id": "CVE-2026-126297",
  "ghsa_id": "GHSA-qvhx-rvgc-jhwf",
  "euvd_id": "EUVD-2026-125224",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Algorithmic denial of service in NLTK ConllCorpusReader",
  "summary": "NLTK through 3.10.3 can consume excessive CPU while processing untrusted CoNLL data through ConllCorpusReader.srl_instances(). A crafted SRL corpus can delay or block the processing worker; exposure requires attacker-controlled corpus input and use of this SRL-specific API.",
  "mitigation": "Upgrade nltk to version 3.10.4 or later. Until upgraded, restrict untrusted CoNLL SRL input and enforce input-size and CPU-time limits on parsing workers.",
  "vendor": "pip",
  "product": "nltk",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 3.10.3"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "3.10.4"
      ],
      "package_name": "nltk",
      "purl": "pkg:pypi/nltk"
    }
  ],
  "cwes": null,
  "cvss_score": 7.5,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 13.484268183333333,
  "t0_at": "2026-11-13T09:36:27.884000+00:00",
  "signals": {
    "check": {
      "at": "2026-11-14T00:25:26.234718+00:00",
      "days": 0.6173420221990741,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:36:27.884000+00:00",
      "url": null
    },
    "trigger_signal": {
      "at": "2026-11-13T09:36:27.884000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:36:27.884000+00:00",
      "url": "https://github.com/advisories/GHSA-v8f3-6phw-6mh9"
    }
  }
}