libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.21.2 and below, a crafted 792-byte HEIF sequence file with samplesperchunk=0 in the stsc box causes an unsigned integer underflow in the Chunk constructor (mlastsample = 0 + 0 - 1 = UINT32_MAX), mapping all samples to an empty chunk and resulting in a denial of service. When any sample is accessed, the library reads from index 0 of an empty std::vector, causing a guaranteed SEGV (null-page read). The file parses successfully without producing an error; the crash occurs on the first frame access. This issue has been fixed in version 1.22.0.
{
"license": "CC-BY-4.0",
"sources": [
{
"published": "2026-05-19T19:16:48.823Z",
"html_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-32738",
"url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-32738",
"modified": "2026-05-20T14:17:41.080Z",
"database_specific": {
"status": "Analyzed"
},
"id": "CVE-2026-32738",
"imported": "2026-06-05T14:52:24.502Z"
},
{
"published": "2026-05-19T19:03:48Z",
"html_url": "https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-30972",
"url": "https://euvdservices.enisa.europa.eu/api/enisaid?id=EUVD-2026-30972",
"modified": "2026-05-19T19:38:59Z",
"id": "EUVD-2026-30972",
"imported": "2026-06-05T14:52:25.868Z"
}
]
}