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Fencer Vulns
high 7.5

CVE-2026-47247 json

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

published 2026-07-21 3 mo ago modified 2026-10-24 15 d ago also EUVD-2026-46641 , JLSEC-2026-1096

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.5%
EPSS 0.5% chance of exploitation in 30 days, percentile 41%
public exploits
0
none known

Summary

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.

Patch / fix

  • julia libheif_jll 1.22.2000+0
  • struktur libheif 1.22.0
  • libheif Debian 13 1.19.8-1+deb13u1
  • libheif Debian 14 1.23.1-1

debian advisories DEBIAN-CVE-2026-47247

  • libheif Ubuntu 24.04 LTS 1.17.6-1ubuntu4.4
  • libheif Ubuntu 25.10 1.20.2-1ubuntu0.4
  • libheif Ubuntu 26.04 LTS 1.21.2-3ubuntu0.1
  • libheif Ubuntu Pro 20.04 LTS 1.6.1-1ubuntu0.1~esm3
  • libheif Ubuntu Pro 22.04 LTS 1.12.0-2ubuntu0.1~esm3

ubuntu advisories UBUNTU-CVE-2026-47247

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • libheif SLE Module for Package Hub 15 SP7, SLE Module for Desktop Applications 15 SP7 1.23.0-150700.3.15.1
  • libheif SLES for SAP applications 16.0, SLES 16.0 1.23.0-160000.1.1

suse advisories SUSE-SU-2026:2622-1SUSE-SU-2026:22153-1

  • libheif openSUSE Leap 16.0 1.23.0-160000.1.1
  • libheif openSUSE Tumbleweed 1.22.2-1.1

opensuse advisories openSUSE-SU-2026:20974-1openSUSE-SU-2026:10878-1

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-47247 updated cvss 7.5

libheif: libheif: Information disclosure via crafted AVIF/HEIC files

  • Red Hat All currently supported Red Hat products
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
Proof of concept is public
Automatable
yes
Technical impact
partial
Assessed
3 mo ago

Exploit prediction

0.48% chance of exploitation in the next 30 days, higher than 41% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/strukturag/libheif/security/advisories/GHSA-2vh6-whr3-cmq3 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
OSV 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Affected packages

ecosystem package affected fixed in
julia libheif_jll
<1.22.2000+0
1.22.2000+0

Affected products

  • strukturag libheif

Classification

Weakness
  • 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

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.