CVE-2026-110601
CVE-2026-110601 · libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 5.8 · Medium · EPSS 0.2% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
libsixel
- Versions
- ≥ 0, < 1.8.7-r1: Affected (custom)
- ≥ 1.9.0, ≤ 1.10.5: Affected (custom)
Update to 1.8.7-r1
libsixel Debian:12
- Versions
- 1.10.3-3
- 1.10.5-1
- 1:1.8.7-1
- 1:1.8.7-2
- 1:1.8.7-3
- 1:1.8.7-4
- 1:1.8.7-5
- 1:1.8.7-6
- 1:1.8.7-r2-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Debian:13
- Versions
- 1.10.5-1
- 1:1.8.7-1
- 1:1.8.7-2
- 1:1.8.7-3
- 1:1.8.7-4
- 1:1.8.7-5
- 1:1.8.7-6
- 1:1.8.7-r2-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Debian:14
- Versions
- 1.10.5-1
- 1:1.8.7-1
- 1:1.8.7-2
- 1:1.8.7-3
- 1:1.8.7-4
- 1:1.8.7-5
- 1:1.8.7-6
- Affected ranges
- ECOSYSTEM: < 1:1.8.7-r2-1
Update to 1:1.8.7-r2-1
libsixel Ubuntu:16.04:LTS
- Versions
- 1.4.2-1
- 1.5.2-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Ubuntu:18.04:LTS
- Versions
- 1.5.2-2
- 1.7.3-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Ubuntu:20.04:LTS
- Versions
- 1.8.2-1
- 1.8.2-2.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Ubuntu:22.04:LTS
- Versions
- 1.8.6-2
- 1.10.3-2
- 1.10.3-3
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Ubuntu:24.04:LTS
- Versions
- 1.10.3-3
- 1.10.3-3build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Ubuntu:26.10
- Versions
- 1.10.5-1build1
- 1:1.8.7-r2-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
libsixel Ubuntu:26.04:LTS
- Versions
- 1.10.5-1
- 1.10.5-1build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
Original sources
- 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
- https://nvd.nist.gov/vuln/detail/CVE-2026-110601