CVE-2026-112393

{
  "etk_id": "ETK-2026-2236",
  "cve_id": "CVE-2026-112393",
  "display_id": "CVE-2026-112393",
  "ghsa_id": "GHSA-332p-7hrc-92wf",
  "euvd_id": "EUVD-2026-104603",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Heap buffer overflow in Pillow TIFF in-memory writer",
  "summary": "Pillow versions before 13.0.0 can overflow a heap buffer and expose stale heap data when a service re-saves compressed TIFF input to an in-memory or other non-file-descriptor destination. An attacker must be able to provide TIFF content that the service opens and writes back as TIFF through such a destination; the overflow can crash the process and may permit further impact.",
  "mitigation": "Upgrade Pillow to version 13.0.0 or later. Until upgraded, avoid re-saving untrusted TIFF images to BytesIO or other destinations without a usable file descriptor; use real file-backed outputs where feasible.",
  "vendor": "pip",
  "product": "Pillow",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        "<= 12.3.0"
      ],
      "ecosystem": "pip",
      "fixed_versions": [
        "13.0.0"
      ],
      "package_name": "Pillow",
      "purl": "pkg:pypi/Pillow"
    }
  ],
  "cwes": [
    122
  ],
  "cvss_score": 9.2,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
  "epss_score": null,
  "epss_percentile": null,
  "epss_asof": null,
  "automation": "contextual",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 11.331279716666666,
  "t0_at": "2026-10-19T20:46:40.784000+00:00",
  "signals": {
    "trigger_signal": {
      "at": "2026-10-17T10:54:43+00:00",
      "days": -2.411085462962963,
      "is_lower_bound": false,
      "measured_at": "2026-10-19T20:46:40.784000+00:00",
      "url": "https://github.com/python-pillow/Pillow/security/advisories/GHSA-332p-7hrc-92wf"
    }
  }
}