CVE-2019-19777: Nothings Stb Image.h

High severity, CVSS 8.8. EPSS: 1.4% chance of exploitation in the next 30 days.

stb_image.h (aka the stb image loader) 2.23, as used in libsixel and other products, has a heap-based buffer over-read in stbi__load_main.

Affected products

• Nothings Stb Image.h: version 2.23 only
• Saitoha Libsixel: version 1.8.2 only

Published 2019-12-13. Last modified 2026-06-17.