CVE-2026-110601

EUVD-2026-101229
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.
ProviderTypeBase ScoreAtk. VectorAtk. ComplexityPriv. RequiredVector
VulnCheckCNA
6.3 MEDIUM
LOCAL
HIGH
NONE
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
Base Score
CVSS 3.x
EPSS Score
Percentile: Unknown
Early Detection
Affected products identified ahead of NVD analysis through intelligence sources.
VendorProductVersionSource
saitohalibsixel
1.9.0 ≤
𝑥
≤ 1.10.5
CNA
Common Weakness Enumeration
References
https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240
https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248
https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047
https://github.com/saitoha/libsixel/issues/220
https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1
https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write
https://www.vulncheck.com/advisories/libsixel-before-1.8.7-r1-and-1.9.0-through-1.10.5-heap-out-of-bounds-write-via-gif