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Fencer Vulns
high 8.8

CVE-2026-32740 json

libheif: Heap-Buffer-Overflow Write in Grid Tile Chroma Compositing

published 2026-05-19 5 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-30978 , JLSEC-2026-572

cvss
8.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.7%
EPSS 0.7% chance of exploitation in 30 days, percentile 52%
public exploits
0
none known

Summary

libheif is a HEIF and AVIF file format decoder and encoder. Versions 1.21.2 and prior contain a heap-buffer-overflow (write) vulnerability in the grid tile compositing, allowing an attacker to write 64 bytes of fully attacker-controlled data past the end of a chroma plane heap allocation by crafting a HEIF/AVIF file with a 1×4 grid of odd-height tiles. The overflow is triggered during normal image decoding with default build configuration. The written bytes are chroma (Cb/Cr) pixel values from the attacking tile, giving the attacker full control over the overflow content. This issue has been fixed in version 1.22.0.

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-2026-32740

  • libheif Ubuntu 25.10 1.20.2-1ubuntu0.4
  • libheif Ubuntu 26.04 LTS 1.21.2-3ubuntu0.1

ubuntu advisories UBUNTU-CVE-2026-32740

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

  • libheif Alpine 3.23 1.23.0-r0
  • libheif Alpine 3.24 1.22.2-r0

alpine advisories ALPINE-CVE-2026-32740

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

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-2026-32740 updated cvss 8.8

libheif: libheif: Arbitrary code execution or denial of service via crafted HEIF/AVIF file

  • Red Hat Enterprise Linux 10 glycin-loaders
    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
none
Automatable
no
Technical impact
total
Assessed
5 mo ago

Exploit prediction

0.68% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/strukturag/libheif/security/advisories/GHSA-frfr-f3vg-2g6j referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CISA ADP 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
OSV 3.1 8.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Affected packages

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

Affected products

  • strukturag libheif
  • Red Hat Red Hat Enterprise Linux 10

Classification

Weakness

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.