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Fencer Vulns
medium 5.5

CVE-2020-29385 json

GNOME gdk-pixbuf (aka GdkPixbuf) before 2.42.2 allows a denial of service (infinite loop) in lzw.c in the function write_indexes.

published 2020-12-26 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-21758

cvss
5.5
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
1.5%
EPSS 1.5% chance of exploitation in 30 days, percentile 75%
public exploits
0
none known

Summary

GNOME gdk-pixbuf (aka GdkPixbuf) before 2.42.2 allows a denial of service (infinite loop) in lzw.c in the function write_indexes. if c->self_code equals 10, self->code_table[10].extends will assign the value 11 to c. The next execution in the loop will assign self->code_table[11].extends to c, which will give the value of 10. This will make the loop run infinitely. This bug can, for example, be triggered by calling this function with a GIF image with LZW compression that is crafted in a special way.

Patch / fix

  • gnome gdk-pixbuf 2.42.2
  • gdk-pixbuf Debian 14, Debian 13, Debian 12 2.42.2+dfsg-1

debian advisories DEBIAN-CVE-2020-29385

  • gdk-pixbuf Ubuntu 20.04 LTS 2.40.0+dfsg-3ubuntu0.1

ubuntu advisories UBUNTU-CVE-2020-29385

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-pixbuf SLE Module for Desktop Applications 15 SP2, SLE Module for Basesystem 15 SP2 2.40.0-3.3.1

suse advisories SUSE-SU-2021:0184-1

  • gdk-pixbuf openSUSE Tumbleweed 2.42.6-3.2
  • gdk-pixbuf openSUSE Leap 15.2 2.40.0-lp152.2.3.1

opensuse advisories openSUSE-SU-2024:10779-1openSUSE-SU-2021:0150-1

  • gdk-pixbuf Alpine 3.11 2.40.0-r2
  • gdk-pixbuf Alpine 3.12 2.40.0-r4
  • gdk-pixbuf Alpine 3.24, Alpine 3.23, Alpine 3.22 +9 more 2.42.2-r0

alpine advisories ALPINE-CVE-2020-29385

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

  • gdk-pixbuf2 Arch Linux 2.42.2-1
  • lib32-gdk-pixbuf2 Arch Linux 2.42.2-1

arch linux advisories AVG-1328AVG-1329

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-2020-29385 updated cvss 5.5

gdk-pixbuf: DoS in lzw.c

  • 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, mingw-gdk-pixbuf, mingw32-gdk-pixbuf, mingw64-gdk-pixbuf, gdk-pixbuf2-modules Red Hat Enterprise Linux 9 gdk-pixbuf2, 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

1.54% chance of exploitation in the next 30 days, higher than 75% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 5.5 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

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.