Vulnerability Details 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.002
EPSS Ranking 7.7%
CVSS Severity
CVSS v3 Score 6.1
References
Products affected by CVE-2026-47251
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cpe:2.3:a:struktur:libheif:1.0.0
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cpe:2.3:a:struktur:libheif:1.1.0
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cpe:2.3:a:struktur:libheif:1.10.0
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cpe:2.3:a:struktur:libheif:1.11.0
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cpe:2.3:a:struktur:libheif:1.12.0
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cpe:2.3:a:struktur:libheif:1.13.0
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cpe:2.3:a:struktur:libheif:1.14.0
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cpe:2.3:a:struktur:libheif:1.14.1
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cpe:2.3:a:struktur:libheif:1.14.2
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cpe:2.3:a:struktur:libheif:1.15.0
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cpe:2.3:a:struktur:libheif:1.15.1
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cpe:2.3:a:struktur:libheif:1.15.2
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cpe:2.3:a:struktur:libheif:1.16.0
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cpe:2.3:a:struktur:libheif:1.16.1
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cpe:2.3:a:struktur:libheif:1.16.2
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cpe:2.3:a:struktur:libheif:1.17.0
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cpe:2.3:a:struktur:libheif:1.17.1
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cpe:2.3:a:struktur:libheif:1.17.2
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cpe:2.3:a:struktur:libheif:1.17.3
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cpe:2.3:a:struktur:libheif:1.17.4
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cpe:2.3:a:struktur:libheif:1.17.5
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cpe:2.3:a:struktur:libheif:1.17.6
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cpe:2.3:a:struktur:libheif:1.18.0
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cpe:2.3:a:struktur:libheif:1.18.1
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cpe:2.3:a:struktur:libheif:1.18.2
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cpe:2.3:a:struktur:libheif:1.19.0
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cpe:2.3:a:struktur:libheif:1.19.1
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cpe:2.3:a:struktur:libheif:1.19.2
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cpe:2.3:a:struktur:libheif:1.19.3
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cpe:2.3:a:struktur:libheif:1.19.4
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cpe:2.3:a:struktur:libheif:1.19.5
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cpe:2.3:a:struktur:libheif:1.19.6
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cpe:2.3:a:struktur:libheif:1.19.7
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cpe:2.3:a:struktur:libheif:1.19.8
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cpe:2.3:a:struktur:libheif:1.2.0
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cpe:2.3:a:struktur:libheif:1.20.0
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cpe:2.3:a:struktur:libheif:1.20.1
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cpe:2.3:a:struktur:libheif:1.20.2
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cpe:2.3:a:struktur:libheif:1.21.0
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cpe:2.3:a:struktur:libheif:1.21.1
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cpe:2.3:a:struktur:libheif:1.21.2
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cpe:2.3:a:struktur:libheif:1.3.0
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cpe:2.3:a:struktur:libheif:1.3.1
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cpe:2.3:a:struktur:libheif:1.3.2
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cpe:2.3:a:struktur:libheif:1.4.0
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cpe:2.3:a:struktur:libheif:1.5.0
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cpe:2.3:a:struktur:libheif:1.5.1
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cpe:2.3:a:struktur:libheif:1.6.0
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cpe:2.3:a:struktur:libheif:1.6.1
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cpe:2.3:a:struktur:libheif:1.6.2
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cpe:2.3:a:struktur:libheif:1.8.0
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cpe:2.3:a:struktur:libheif:1.9.0
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cpe:2.3:a:struktur:libheif:1.9.1