CVE•Published 2026-07-21•Modified 2026-07-27•0 articles on news•4 live references•NVD data

CVE-2026-47247Struktur · Libheif

Vulnerability data via NVD (ingested)

CVSS v3.1

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS percentile

Exploit Prediction Scoring System · top 66% of all CVEs

Weaknesses (CWE)

CWE-200Exposure of Sensitive Information to an Unauthorized Actor CWE-226Sensitive Information in Resource Not Removed Before Reuse CWE-682Incorrect Calculation CWE-908Use of Uninitialized Resource

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.

Timeline

Published 2026-07-21

Modified 2026-07-27

External references

NVD MITRE Exploit-DB VulnCheck

Search for exposed instances

Shodan + Censys queries derived from NVD's CPE data. The vuln tag catches assets Shodan has explicitly linked to this CVE; the product / banner fingerprints find exposed instances even when the vuln tag was never applied (which is common).

Shodan · vuln tag0 hosts

vuln:CVE-2026-47247

Hosts Shodan has explicitly fingerprinted as vulnerable.

Shodan · WP plugin path

http.html:"/wp-content/plugins/libheif/"

Matches any site loading the "libheif" plugin — doesn't rely on Shodan's vuln tag.

Shodan · product

product:"Struktur Libheif"

All exposed Struktur Libheif instances — cross-reference with the CVE's affected-version range.

Shodan · banner/body mention

http.html:"Libheif"

HTTP body or banner mentions "Libheif" — catches deploys Shodan didn't identify as a product.