CVE-2026-110601

Medium

Description

libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 contains a heap out-of-bounds write vulnerability in gif_init_frame() in src/fromgif.c, which never checks the GIF transparent color index against the palette size. Attackers can supply a crafted GIF with a small color table and large transparent index, processed with a background color set, to write bytes past the palette buffer, causing heap corruption or crashes.

SeverityMedium

CVSS6.3

Exploit probability—

ProductSaitoha Libsixel

PublishedOct 14, 2026

First seenOct 14, 2026

Weakness typeCWE-787Out-of-bounds write

How to fix

Update

saitoha libsixel1.8.7-r1 or later

Patches

github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047

Vendor advisories

github.com/saitoha/libsixel/releases/tag/v1.8.7-r1

Affected products

Product	Affected versions	Fixed in
saitoha libsixel	v < 1.8.7-r1, 1.9.0 ≤ v ≤ 1.10.5	1.8.7-r1

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