{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "1.19.0"
              },
              {
                "fixed": "1.23.3"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "REFERENCES"
            ]
          },
          "events": [
            {
              "introduced": "c4e4657dcf6bcc06e934632f97736f7c78dbff9e"
            },
            {
              "fixed": "8bfed9a9ed008e4ef28abc736284a90d3cba754f"
            },
            {
              "fixed": "78c9746aea226b22885e8d35241353ce669c4ea5"
            }
          ],
          "repo": "https://github.com/strukturag/libheif",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-hh47-fhqr-cj2r"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-125"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84451.json"
  },
  "details": "libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.3, the no-icef full-item branch of unc_decoder::get_compressed_image_data_uncompressed() in libheif/codecs/uncompressed/unc_decoder.cc retains an addition-based range check that can wrap when a crafted uncompressed tile grid produces a large range_start_offset and range_size. The overflow makes the bounds comparison pass and allows heif_image_handle_decode_image_tile() to call memcpy() with an invalid source pointer and a very large length when decoding a valid high-index advertised tile. This incomplete remediation of CVE-2026-62292 can reliably crash tile-processing applications, while whole-image decoding is not claimed to reach the demonstrated path. This issue is fixed in version 1.23.3.",
  "id": "CVE-2026-84451",
  "modified": "2026-09-20T11:30:46.189079451Z",
  "published": "2026-09-18T16:02:22.529Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/strukturag/libheif/releases/tag/v1.23.3"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/84xxx/CVE-2026-84451.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/strukturag/libheif/security/advisories/GHSA-hh47-fhqr-cj2r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-84451"
    },
    {
      "type": "FIX",
      "url": "https://github.com/strukturag/libheif/commit/8bfed9a9ed008e4ef28abc736284a90d3cba754f"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libheif: Incomplete fix for CVE-2026-62292 leaves libheif vulnerable to an out-of-bounds read"
}