libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing_CVE-2026-32740

{
    "lastseen": "",
    "description": "libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1\u00d74 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.",
    "published": "2026-05-19T19:22:07.743Z",
    "modified": "2026-05-19T19:22:07.743Z",
    "type": "cve",
    "title": "libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing",
    "source": "GitHub_M",
    "references": "https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j\nhttps://github.com/strukturag/libheif/releases/tag/v1.22.0",
    "id": "CVE-2026-32740",
    "bulletinFamily": "",
    "cwe": [
        "CWE-787"
    ],
    "cvelist": null,
    "sourceData": "strukturag libheif < 1.22.0",
    "sourceHref": "",
    "cvss": {
        "score": 8.8,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "libheif",
    "version": "< 1.22.0",
    "vendor": "strukturag",
    "ai_description": "Heap-buffer-overflow vulnerability in grid tile compositing, allowing an attacker to write controlled data past the end of a chroma plane heap allocation",
    "ai_severity": "High",
    "ai_vendor": "strukturag",
    "ai_product": "libheif",
    "ai_version": "1.21.2 and prior",
    "ai_score": 8.8
}