CVE-2026-110601: saitoha libsixel

libsixel before 1.8.7-r1 and 1.9.0 through 1.10.5 Heap Out-of-Bounds Write via GIF

CVSS 5.8 MediumEPSS 0.0024 · 14th percentile

Published by the CVE Program (CNA: VulnCheck) at 14 Oct 2026, 14:16 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
saitoha	libsixel https://github.com pkg:github/saitoha/libsixel	affected before 1.8.7-r1 custom affected 1.9.0 to 1.10.5, inclusive custom Other versions: unaffected

Identifiers

CVE-2026-110601

CNA

VulnCheck

Weakness (CWE)

CWE-787

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
5.8	Medium	4.0	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	CNA (VulnCheck)Used for this record
6.3	Medium	3.1	CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:H	CNA (VulnCheck)

CISA KEV Not listed.
EPSS 0.0024, the 14th percentile, on 7 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 14 Oct 2026. New records show when each source confirmed them.

Sources

References from the CNA

github.com/saitoha/libsixel/issues/220 issue-tracking
github.com/saitoha/libsixel/commit/bdbab09816eb9188429c37a50b97c5e66dfe5047 patch
github.com/saitoha/libsixel/releases/tag/v1.8.7-r1 release-notes
github.com/saitoha/libsixel/blob/v1.8.7/src/fromgif.c#L182-L248 technical-description
github.com/libsixel/libsixel/blob/v1.10.5/src/fromgif.c#L219-L240 technical-description
hackmd.io/@haind-pwn/libsixel-gif-transparent-index-oob-write third-party-advisory
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 third-party-advisory

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.