ETK-2026-2691Zero's internal tracking ID, independent of the CVE number.

{
  "etk_id": "ETK-2026-2691",
  "cve_id": null,
  "display_id": "ETK-2026-2691",
  "ghsa_id": "GHSA-rcqc-842v-m26h",
  "euvd_id": null,
  "status": "published",
  "anchor_state": "awaiting_cve",
  "title": "Parallel HEIF grid decoding deadlock in libheif",
  "summary": "libheif versions 1.21.0 through 1.23.6 can deadlock while processing malformed HEIF grid images with parallel decoding enabled. An attacker who can supply a HEIF file to an application using the affected decoder can cause the image-processing task or worker to remain blocked.",
  "mitigation": "Upgrade libheif to version 1.23.7 or later. Until upgraded, use strict or single-threaded decoding for untrusted HEIF files where those options are available.",
  "vendor": "other",
  "product": "libheif",
  "affected": [
    {
      "affected_notes": [],
      "affected_ranges": [
        ">= 1.21.0, < 1.23.7"
      ],
      "ecosystem": "other",
      "fixed_versions": [
        "1.23.7"
      ],
      "package_name": "libheif",
      "purl": null
    }
  ],
  "cwes": [
    833
  ],
  "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": false,
  "check_confidence_basis": null,
  "exploit": false,
  "pipeline_minutes": 30.412414633333334,
  "t0_at": null,
  "signals": {
    "trigger_signal": {
      "at": "2026-10-26T11:51:38+00:00",
      "days": -0.5934210312962963,
      "is_lower_bound": true,
      "measured_at": "2026-10-27T02:06:09.606846+00:00",
      "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-rcqc-842v-m26h"
    }
  }
}