CVE-2021-46700: Saitoha Libsixel

Medium severity, CVSS 6.5. EPSS: 1% chance of exploitation in the next 30 days.

In libsixel 1.8.6, sixel_encoder_output_without_macro (called from sixel_encoder_encode_frame in encoder.c) has a double free.

Affected products

• Saitoha Libsixel: version 1.8.6 only

Published 2022-02-19. Last modified 2026-06-17.