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.

CVSS v3 7.5 HIGH

7.5^/10

CVSS v3 : HIGH

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact NONE

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3	Exploit Vendor Advisory Mitigation
https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3	Exploit Vendor Advisory Mitigation

Configurations

Configuration 1 (hide)

cpe:2.3:a:struktur:libheif:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-07-21 22:17

Updated : 2026-07-27 15:20

NVD link : CVE-2026-47247

Mitre link : CVE-2026-47247

CVE.ORG link : CVE-2026-47247

JSON object : View

Products Affected

struktur

libheif

CWE

CWE-200

Exposure of Sensitive Information to an Unauthorized Actor

CWE-226

Sensitive Information in Resource Not Removed Before Reuse

CWE-682

Incorrect Calculation

CWE-908

Use of Uninitialized Resource

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