CVE-2021-46829

Severity: high (CVSS 7.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2022-07-24 · updated 2026-06-17
Weakness: CWE-190

Description

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.

Affected products

Debian Linux: 11.0
Fedoraproject Fedora: 35
GNOME Gdk-Pixbuf: before 2.42.8 — fixed in 2.42.8

How to fix

Upgrade to a fixed version: GNOME Gdk-Pixbuf 2.42.8. Check the vendor advisory for mitigations.

References

http://www.openwall.com/lists/oss-security/2022/07/25/1
https://github.com/pedrib/PoC/blob/master/fuzzing/CVE-2021-46829/CVE-2021-46829.md
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/5398f04d772f7f8baf5265715696ed88db0f0512
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/bca00032ad68d0b0aa2c1f7558db931e52bd9cd2
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/issues/190
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/merge_requests/121
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/M5IHHEYFD6GDZVALKIPPRD2U4JNZUZWR/
https://www.debian.org/security/2022/dsa-5228
https://www.openwall.com/lists/oss-security/2022/07/23/1
http://www.openwall.com/lists/oss-security/2022/07/25/1
https://github.com/pedrib/PoC/blob/master/fuzzing/CVE-2021-46829/CVE-2021-46829.md
https://gitlab.gnome.org/GNOME/gdk-pixbuf/-/commit/5398f04d772f7f8baf5265715696ed88db0f0512

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