CVE-2020-29385

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2020-12-26 · updated 2026-06-17
Weakness: CWE-835

Description

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.

Affected products

Canonical Ubuntu Linux: 20.04, 20.10
Fedoraproject Fedora: 33, 34
GNOME Gdk-Pixbuf: from 2.39.2 (excl.) before 2.42.2 — fixed in 2.42.2

How to fix

Upgrade to a fixed version: GNOME Gdk-Pixbuf 2.42.2. Check the vendor advisory for mitigations.

References

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