CVE-2026-110601CWE-787

CVE-2026-110601

Medium · published October 14, 2026

CVSS v3.1
6.3
EPSS
0%
Percentile
6.5
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
6.3 · MEDIUM
Vector
CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
CVSS v4.0
5.8 · 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
EPSS
0.00173 · 6.5th percentile
Weakness
CWE-787 · Out-of-bounds Write
Published
2026-10-14T19:17Z
References (8)
https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240 · [email protected]https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248 · [email protected]https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047 · [email protected]https://github.com/saitoha/libsixel/issues/220 · [email protected]https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1 · [email protected]https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write · [email protected]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 · [email protected]https://github.com/saitoha/libsixel/issues/220 · 134c704f-9b21-4f2e-91b3-4a467353bcc0
EPSS history
Timeline
  • 16 OCT 03:27Z
    EPSS moved — → 0%
    epss
  • 14 OCT 14:16Z
    libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF
    cvelistv5
  • 14 OCT 14:16Z
    libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF
    cvelistv5