What’s Vulnerable › Vulnerabilities

CVE-2021-40656

• Severity: high (CVSS 8.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2022-04-08 · updated 2026-06-17
• Weakness: CWE-787

Description

libsixel before 1.10 is vulnerable to Buffer Overflow in libsixel/src/quant.c:867.

Affected products

• Libsixel: before 1.10.0 — fixed in 1.10.0

How to fix

Upgrade to a fixed version: Libsixel 1.10.0. Check the vendor advisory for mitigations.

References

• https://github.com/libsixel/libsixel/issues/25
• https://github.com/libsixel/libsixel/issues/25

Get alerted when CVE-2021-40656 or the next vulnerability affects your stack