CVE-2026-110601: Out-of-bounds Write in saitoha libsixel
Description
libsixel versions before 1.8.7-r1 and from 1.9.0 through 1.10.5 contain a heap out-of-bounds write vulnerability in the gif_init_frame() function. This occurs because the function does not verify that the GIF transparent color index is within the bounds of the palette size. An attacker can exploit this by crafting a GIF with a small color table and a large transparent index, which when processed with a background color set, causes heap corruption or crashes.
CVSS v4.0
Score 5.8medium
Affected software
saitoha
libsixel
pkg:github/libsixelRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in libsixel's gif_init_frame() function arises from a missing bounds check on the GIF transparent color index relative to the palette size. Specifically, if a crafted GIF file contains a transparent color index larger than the palette, the function writes beyond the allocated palette buffer on the heap. This heap out-of-bounds write can lead to memory corruption or application crashes. The affected versions are all versions before 1.8.7-r1 and versions from 1.9.0 up to and including 1.10.5.
Potential Impact
Exploitation of this vulnerability can cause heap corruption or crashes in applications using vulnerable libsixel versions when processing maliciously crafted GIF images. This may lead to denial of service or potentially other undefined behavior due to memory corruption. No known exploits in the wild have been reported.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a patch is available, avoid processing untrusted GIF images with vulnerable versions of libsixel or apply other application-level mitigations to prevent exposure to crafted GIF files.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-10-14T13:07:20.557Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acf92e92cdf04f6568a2e1b
Added to database: 10/14/2026, 14:34:17 UTC
Last enriched: 10/14/2026, 15:18:41 UTC
Last updated: 10/14/2026, 19:00:33 UTC
Views: 9
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