CVE WatchJul 21, 2026

CVE-2026-47247

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory a

CVSS

7.5

High

EPSS

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KEV

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Exploit Today

0-100

Published: Jul 21, 2026 · Last modified: Jul 21, 2026 · CWE-200 · CWE-226 · CWE-682

EPSS · 30d

Not enough EPSS history yet.

Technical description

libheif is a HEIF and AVIF file format decoder and encoder. Prior to version 1.22.0, two bugs in libheif chain to leak process heap memory as visible pixel values in decoded grid images. An attacker who uploads a crafted AVIF/HEIC file to any server-side image processor (WordPress, Sharp/libvips, ImageMagick, etc.) can recover heap data - including library function pointers sufficient to defeat ASLR, or any other secret - from the publicly-downloadable transcoded JPEG/PNG/WebP output. Local attack vectors are also possible. Version 1.22.0 fixes the issue.

Official references

github.comhttps://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3

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