CVE-2026-126304

{
  "etk_id": "ETK-2026-4429",
  "cve_id": "CVE-2026-126304",
  "display_id": "CVE-2026-126304",
  "ghsa_id": "GHSA-7r4r-6ppg-7ff8",
  "euvd_id": "EUVD-2026-125216",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Symlink containment bypass in NLTK YCOECorpusReader",
  "summary": "NLTK YCOECorpusReader before 3.10.4 can follow malicious psd or pos directory symlinks outside the loaded YCOE corpus root. An attacker who controls a YCOE corpus loaded by an application can cause read-only disclosure of files elsewhere in the permitted NLTK data sandbox.",
  "mitigation": "Upgrade nltk to version 3.10.4 or later. Until upgraded, do not load untrusted YCOE corpora and ensure corpus directories do not contain attacker-controlled directory symlinks.",
  "vendor": "pip",
  "product": "nltk",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 3.10.0, <= 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:H/I:N/A:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": true,
  "check_confidence_basis": "assessed",
  "exploit": false,
  "pipeline_minutes": 10.650298016666667,
  "t0_at": "2026-11-13T09:36:23.105000+00:00",
  "signals": {
    "check": {
      "at": "2026-11-13T21:37:39.328482+00:00",
      "days": 0.5008822162268518,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:36:23.105000+00:00",
      "url": null
    },
    "public_poc": {
      "at": "2026-11-13T20:55:16+00:00",
      "days": 0.4714455439814815,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:36:23.105000+00:00",
      "url": "https://github.com/advisories/GHSA-qg35-44qx-7vrr"
    },
    "trigger_signal": {
      "at": "2026-11-13T09:36:23.105000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-11-13T09:36:23.105000+00:00",
      "url": "https://github.com/advisories/GHSA-qg35-44qx-7vrr"
    }
  }
}