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 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.

• CWE-200
• CWE-226
• CWE-682
• CWE-908

• https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3Exploit, Vendor Advisory, Mitigation
• https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3Exploit, Vendor Advisory, Mitigation

Published

Jul 21, 2026

Last Modified

Jul 27, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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