CVE-2026-84383

{
  "etk_id": "ETK-2026-176",
  "cve_id": "CVE-2026-84383",
  "display_id": "CVE-2026-84383",
  "ghsa_id": "GHSA-g89c-p67h-r497",
  "euvd_id": "EUVD-2026-83019",
  "status": "published",
  "anchor_state": "anchored",
  "title": "Heap buffer overflow in strukturag libheif decoding",
  "summary": "strukturag libheif from version 1.22.0 through versions before v1.23.2 is affected when decoding HEIF, HEIC, or AVIF files. An attacker able to supply a malicious image to an application using the library’s decoder may trigger an out-of-bounds heap write.",
  "mitigation": "Upgrade strukturag libheif to v1.23.2 or later. Until the upgrade is deployed, prevent processing of untrusted HEIF, HEIC, and AVIF files.",
  "vendor": "strukturag",
  "product": "libheif",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">=v1.22.0, <= v1.23.1"
      ],
      "ecosystem": null,
      "fixed_versions": [
        "v1.23.2"
      ],
      "package_name": null,
      "purl": null
    }
  ],
  "cwes": null,
  "cvss_score": 9.8,
  "cvss_src": "cna_vendor",
  "cvss_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss_score": 0.0061,
  "epss_percentile": 0.4816,
  "epss_asof": "2026-10-20",
  "automation": "deterministic",
  "check": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 29.923919783333332,
  "t0_at": "2026-09-18T15:55:46.914000+00:00",
  "signals": {
    "public_poc": {
      "at": "2026-09-29T17:40:08+00:00",
      "days": 11.072466273148148,
      "is_lower_bound": false,
      "measured_at": "2026-09-18T15:55:46.914000+00:00",
      "url": "https://github.com/dinosn/libheif-cve-2026-84383-lab"
    },
    "trigger_signal": {
      "at": "2026-09-18T15:55:46.914000+00:00",
      "days": 0,
      "is_lower_bound": false,
      "measured_at": "2026-09-18T15:55:46.914000+00:00",
      "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-g89c-p67h-r497"
    }
  }
}