{"id":"CVE-2026-110601","summary":"libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF","details":"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.","modified":"2026-10-15T02:47:45.367623063Z","published":"2026-10-14T14:16:43.022Z","database_specific":{"cwe_ids":["CWE-787"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110601.json","cna_assigner":"VulnCheck"},"references":[{"type":"WEB","url":"https://github.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/110xxx/CVE-2026-110601.json"},{"type":"ARTICLE","url":"https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240"},{"type":"PACKAGE","url":"https://github.com/saitoha/libsixel"},{"type":"ARTICLE","url":"https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248"},{"type":"FIX","url":"https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047"},{"type":"REPORT","url":"https://github.com/saitoha/libsixel/issues/220"},{"type":"ADVISORY","url":"https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1"},{"type":"ADVISORY","url":"https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-110601"},{"type":"ADVISORY","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"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/libsixel/libsixel","events":[{"introduced":"857185461d8703bbe4f4ed4b5c18f8292fd675f2"},{"last_affected":"37026b01a0bd38634ae0a8c5017bd4671101fe08"}],"database_specific":{"extracted_events":[{"introduced":"1.9.0"},{"last_affected":"1.10.5"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.10.5","v1.10.4","v1.10.2","v1.10.1","v1.10.0","v1.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110601.json"}},{"ranges":[{"type":"GIT","repo":"https://github.com/saitoha/libsixel","events":[{"introduced":"0"},{"fixed":"6d628cf43548e1f2739cbb13afcc6e8257868db5"}],"database_specific":{"extracted_events":[{"introduced":"0"},{"fixed":"1.8.7-r1"}],"source":"AFFECTED_FIELD"}}],"versions":["v1.8.7","nightly-latest","v1.8.6","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.3","v1.7.2","v1.7.1","v1.6.1","v1.5.2","v1.5.1","v1.5.0","v1.4.13","v1.4.12","v1.4.11","v1.4.10","v1.4.9","v1.4.8","v1.4.7","v1.4.6","v1.4.5","v1.4.4","v1.4.3","v1.4.2","v1.4.1","v1.4.0","v1.3.6","v1.3.5","v1.3.4","v1.3.3","v1.3.2","v1.3.1","v1.1.2","v1.1.1","v1.1.0","v1.0.2","v1.0.1","v1.0.0","v0.28.0","v0.27.1","v0.27.0","v0.26.0","v0.25.5","v0.25.4","v0.25.3","v0.25.2","v0.25.1","v0.25.0","v0.24.2","v0.24.0","v0.23.2","v0.23.1","v0.23.0","v0.22.3","v0.22.2","v0.22.1","v0.22.0","v0.21.1","v0.21.0","v0.20.0","v0.19.6","v0.19.5","v0.19.4","v0.19.3","v0.19.2","v0.18.0","v0.17.2","v0.17.1","v0.17.0","v0.16.1","v0.16.0","v0.15.0","v0.14.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-110601.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N"}]}