Vulnerability details

CVE-2026-47247

strukturag libheif

libheif Vulnerable to Heap Information Disclosure via Grid Image Gap + Uninitialized Pixel Plane Allocation

CVSS 3.1

7.5High

Official 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.

CVSS scores

Score	Version	Source	Vector
7.5High	3.1	CVEProject cvelistV5 (CNA) (GitHub_M)	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`

Affected products

Vendor	Product	Versions	Source
strukturag	libheif	< 1.22.0	CVEProject cvelistV5 (CNA)

References and advisories

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

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Details

Published: 2026-07-22
Last updated: 2026-07-22
State: Published
Assigner (CNA): GitHub_M

Exploit prediction (EPSS)

0.47%

Probability of exploitation in 30 days

41.6%

Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable: Yes
Exploitation: Proof of concept
Technical impact: Partial

Weaknesses (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