CVE-2026-110601libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF
Updated under an hour ago ()
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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
- 6.3 MEDIUM (v3.1, CNA)CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H
- Weakness (CWE)
- CWE-787
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- VulnCheck
- NVD analysis
- Deferred
- Record last updated
- Oct 14, 2026
- First seen by InfoSec Signals
- Oct 14, 2026
Affected products
saitoha libsixel saitoha:libsixel (from the name) | before 1.8.7-r1; from 1.9.0 through 1.10.5 | CNA record |
References
- https://github.com/saitoha/libsixel/issues/220issue-tracking
- https://github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047patch
- https://github.com/saitoha/libsixel/releases/tag/v1.8.7-r1release-notes
- https://github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248technical-description
- https://github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240technical-description
- https://hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-writethird-party-advisory
- 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-gifthird-party-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.