CVE-2026-47178
Medium
Description
libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2, a crafted HEIF file (uncompressed `unci` codec, tiled, component-interleaved, 4:2:0) triggers a heap out-of-bounds write in libheif's uncompressed tile decoder. The write overwrites the C++ vtable pointer of an adjacent `unc_decoder_component_interleave` object; the next virtual call dispatches to an attacker-chosen address. Version 1.22.0 patches the issue.
SeverityMedium
CVSS6.1
Exploit probability—
ProductStruktur Libheif
PublishedJul 21, 2026
First seenJul 21, 2026
Weakness typeCWE-787Out-of-bounds write
How to fix
Update
- struktur libheif1.22.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| struktur libheif | 1.19.0 ≤ v < 1.22.0 | 1.22.0 |
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