MEDIUM 5.8 NVD
CVE-2026-110601
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
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.
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
This medium severity vulnerability with a CVSS score of 5.8 was published on 2026-10-14 via NVD.
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