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Fencer Vulns
high 7.8

CVE-2021-46829 json

GNOME GdkPixbuf (aka GDK-PixBuf) before 2.42.8 allows a heap-based buffer overflow when compositing or clearing frames in GIF files, as dem…

published 2022-07-24 4 y ago modified 2026-06-17 4 mo ago also EUVD-2021-33484

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.8%
EPSS 0.8% chance of exploitation in 30 days, percentile 56%
public exploits
0
none known

Summary

GNOME GdkPixbuf (aka GDK-PixBuf) before 2.42.8 allows a heap-based buffer overflow when compositing or clearing frames in GIF files, as demonstrated by io-gif-animation.c composite_frame. This overflow is controllable and could be abused for code execution, especially on 32-bit systems.

Patch / fix

  • gnome gdk-pixbuf 2.42.8
  • gdk-pixbuf Debian 14, Debian 13, Debian 12 2.42.8+dfsg-1

debian advisories DEBIAN-CVE-2021-46829

  • gdk-pixbuf Ubuntu 20.04 LTS 2.40.0+dfsg-3ubuntu0.3

ubuntu advisories UBUNTU-CVE-2021-46829

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

  • gdk-pixbuf2 RHEL 9 2.42.6-3.el9
  • gdk-pixbuf2-modules RHEL 9 2.42.6-3.el9

red hat advisories RHSA-2023:2216

  • gdk-pixbuf SLE Module for Desktop Applications 15 SP3, SLE Module for Basesystem 15 SP3, SLE Micro 5.2 +2 more 2.40.0-150200.3.6.1
  • gdk-pixbuf SLE Module for Basesystem 15 SP4, openSUSE Leap 15.4 2.42.8-150400.5.3.1

suse advisories SUSE-SU-2022:2996-1SUSE-SU-2022:2995-1

  • gdk-pixbuf openSUSE Tumbleweed 2.42.8-2.1

opensuse advisories openSUSE-SU-2024:12222-1

  • gdk-pixbuf2 AlmaLinux 9 2.42.6-3.el9
  • gdk-pixbuf2-modules AlmaLinux 9 2.42.6-3.el9

almalinux advisories ALSA-2023:2216

  • gdk-pixbuf2 Arch Linux 2.42.8-1

arch linux advisories AVG-2786

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-2021-46829 updated cvss 7.8

gdk-pixbuf: heap-based buffer overflow when compositing or clearing frames in GIF files

  • Red Hat Enterprise Linux AppStream (v. 9) gdk-pixbuf2 2.42.6-3.el9, gdk-pixbuf2-modules 2.42.6-3.el9
    fixed: vendor fix RHSA-2023:2216
  • Red Hat Enterprise Linux 6 gdk-pixbuf2 Red Hat Enterprise Linux 7 gdk-pixbuf2, gdk-pixbuf2-tests Red Hat Enterprise Linux 8 gdk-pixbuf2, gdk-pixbuf2-xlib, gdk-pixbuf2-modules
    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

Exploit prediction

0.80% chance of exploitation in the next 30 days, higher than 56% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/merge_requests/121 referenced PoC, tagged "exploit" by a source, unverified
  • gitlab.gnome.org https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/190 referenced PoC, tagged "exploit" by a source, unverified
  • github.com https://github.com/pedrib/PoC/blob/master/fuzzing/CVE-2021-46829/CVE-2021-46829.md referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Classification

Weakness
  • CWE-190 Integer Overflow or Wraparound

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.