Security Advisory

CVE-2026-47247

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-21 21:16:59

Last updated 2026-07-22 14:29:24

Assigner GitHub_M

CVSS score 7.5

State PUBLISHED

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.

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