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    CVE-2026-47251

    libheif is a HEIF and AVIF file format decoder and encoder. The fix for CVE-2026-3949 (commit `b97c8b5`, PR #1712) introduced an integer overflow in the very security check it added. The check itself can be bypassed, allowing a crafted HEIF file with a VVC track to trigger the same out-of-bounds heap read that CVE-2026-3949 was meant to prevent. This is a separate, currently-unpatched vulnerability. Issue #1712 was closed as fixed without testing the edge case where `size` is near `UINT32_MAX`. Version 1.22.0 patches the issue.

    Published:Jul 21, 2026
    Last Modified:Jul 27, 2026
    EPS:Jul 21, 2026
    EPSS Score:0.00179
    CVSS Score:6.8

    Affected Products

    Vendor
    Struktur
    Product
    Libheif

    Exploits

    https://github.com/strukturag/libheif/security/advisories/GHSA-p6q9-fhf2-vj9vhttps://github.com/strukturag/libheif/security/advisories/GHSA-p6q9-fhf2-vj9v

    Common Attack Pattern Enumeration and Classification (CAPEC)

    CAPEC-540 Overread Buffers
    CAPEC-92 Forced Integer Overflow

    Related CVEs

    CVE-2026-62377 (CVSS 4.3) — libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF sequence acc…
    CVE-2026-62291 (CVSS 5.3) — libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted image sequence wi…
    CVE-2026-62292 (CVSS 8.7) — libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.1, a crafted uncompressed H…
    CVE-2026-62289 (CVSS 4.3) — libheif is a HEIF and AVIF file format decoder and encoder. In 1.23.0 and earlier, a crafted HEIF or AVIF file…
    CVE-2026-50142 (CVSS 7.5) — libheif is a HEIF and AVIF file format decoder and encoder. From 1.19.0 until 1.23.0, a crafted HEIF sequence …
    CVE-2026-48029 (CVSS 7.1) — libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.19.0 through 1.21.2 have a heap OOB rea…
    CVE-2026-47709 (CVSS 6.9) — libheif is a HEIF and AVIF file format decoder and encoder. Versions prior to 1.22.0 crashes in the public C A…
    CVE-2026-47254 (CVSS 6.1) — libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, `Track::init_sample_timin…
    CVE-2026-47247 (CVSS 7.5) — libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain…
    CVE-2026-47178 (CVSS 6.1) — libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2, a crafted HEIF …

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High