CVE-2026-110601 | BDVDB-2026-389503 Detail
saitohalibsixel
Description#
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.
Impact#
Per CVSS v3.1: confidentiality impact none, integrity impact high, availability impact high. Attack vector: local.
Weaknesses#
- CWE-787 Out-of-bounds Write
References#
- https://github.com/saitoha/libsixel/issues/220
- https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047
- https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1
- https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248
- https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240
- 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
Exploit#
No public exploit known
History#
- Version 1Record published in the CVE List.
- Version 2Most recent update recorded in the CVE List.