libsixel before 1.10 is vulnerable to Buffer Overflow in libsixel/src/quant.c:867.
Priority MEDIUM 40CWE-787Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- High · High · High
- Fix status
- No fix listed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-787 and the CVSS impact.
Summary
libsixel before 1.10 is vulnerable to Buffer Overflow in libsixel/src/quant.c:867.
Why it matters now
EPSS 0.01019 63rd percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix No fix listed No fixed version in the sources yet
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Timeline
- 2026-10-02 Threatist record created from CVE-2021-40656
- 2026-10-03 Alias added: GHSA-46hw-rjq2-89r4
References
More Libsixel vulnerabilities
- TI-2021-18385 libsixel 1.10.0 is vulnerable to Use after free in libsixel/src/dither.c:379. CVSS 3.1HIGH 8.8
- TI-2021-20491 In Libsixel prior to and including v1.10.3, a NULL pointer dereference in the stb_image.h… CVSS 3.1MEDIUM 6.5
- TI-2022-10806 stb_image.h (aka the stb image loader) 2.19, as used in libsixel and other products, has… CVSS 3.1MEDIUM 5.5
Sources
- CVE-2021-40656 · CVE Program
- CVE-2021-40656 · NVD
- FIRST EPSS
- GHSA-46hw-rjq2-89r4 · GitHub Advisory Database · CC BY 4.0
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