CVE-2026-110601
mediumlibsixel 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 th…
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.
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240 disclosure@vulncheck.com
- https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248 disclosure@vulncheck.com
- https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047 disclosure@vulncheck.com
- https://github.com/saitoha/libsixel/issues/220 disclosure@vulncheck.com
- https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1 disclosure@vulncheck.com
- https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write disclosure@vulncheck.com
- https://www.vulncheck.com/advisories/libsixel-before-1.8.7-r1-and-1.9.0-through-1.10.5-hea... disclosure@vulncheck.com
- https://github.com/saitoha/libsixel/issues/220 134c704f-9b21-4f2e-91b3-4a467353bcc0