CVE-2026-47178

mediumCVSS 6.1covered by 1 sourcefirst seen 2026-07-21

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.

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Exploitation outlook

Low exploitation risk0.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 10% of all EPSS-scored CVEs.

Advisory coverage (1)

mediumCVE-2026-47178: libheif is a HEIF and AVIF file format decoder and encoder. In versions 1.19.0 through 1.21.2,…nvd · 2026-07-21

External references

NVD record for CVE-2026-47178

CVE.org record

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