{"id":"CVE-2026-110601","title":"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","summary":"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…","severity":"medium","cvss":6.3,"cvssVector":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H","cwe":["CWE-787"],"published":"2026-10-14","updated":"2026-10-14","sourceUpdated":"2026-10-14T15:17:11.530","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-110601","references":[{"url":"https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240","label":"disclosure@vulncheck.com"},{"url":"https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248","label":"disclosure@vulncheck.com"},{"url":"https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047","label":"disclosure@vulncheck.com"},{"url":"https://github.com/saitoha/libsixel/issues/220","label":"disclosure@vulncheck.com"},{"url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1","label":"disclosure@vulncheck.com"},{"url":"https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write","label":"disclosure@vulncheck.com"},{"url":"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","label":"disclosure@vulncheck.com"}],"tags":["nvd","cve.org"],"ingestedAt":"2026-10-14T15:36:14.002Z","vendor":"saitoha","product":"libsixel","affected":["libsixel < 1.8.7-r1","libsixel >= 1.9.0 <= 1.10.5"],"slug":"CVE-2026-110601","body":"## Overview\n\nlibsixel 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.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":35,"depthScoreParts":{"impact":34.7,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}