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Fencer Vulns
high 7.1

CVE-2026-32882 json

libheif: Heap Buffer OOB Read in overlay compositing due to wrong alpha stride

published 2026-05-19 5 mo ago modified 2026-07-24 3 mo ago also EUVD-2026-30981

cvss
7.1
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 53%
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 over-read in HeifPixelImage::overlay() in libheif/pixelimage.cc. When compositing an overlay image (iovl) whose child image has a different bit depth for the alpha channel than for the color channels, the function indexes into the alpha plane using the color channel stride (in_stride) instead of the previously retrieved alpha_stride, causing reads past the end of the alpha buffer (up to 3,123 bytes for a 100×50 image with 10-bit color and 8-bit alpha). A crafted HEIF file can exploit this to cause a denial of service (crash) or potentially disclose adjacent heap memory through leaked bytes embedded in the decoded output pixels. This issue has been fixed in versionThis issue has been fixed in version 1.22.0.

Patch / fix

  • struktur libheif 1.22.0
  • libheif Debian 13 1.19.8-1+deb13u1
  • libheif Debian 14 1.23.1-1

debian advisories DEBIAN-CVE-2026-32882

  • 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 18.04 LTS 1.1.0-2ubuntu0.1~esm3
  • 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-2026-32882

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-2026-32882 updated cvss 7.1

libheif: libheif: Denial of Service and Information Disclosure vulnerability

  • 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
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
5 mo ago

Exploit prediction

0.71% chance of exploitation in the next 30 days, higher than 53% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/strukturag/libheif/security/advisories/GHSA-hg7q-rjr2-8x46 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H
CISA ADP 3.1 7.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H

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.