CVE-2021-39247: Zint Barcode Generator

Medium severity, CVSS 6.5. EPSS: 0.9% chance of exploitation in the next 30 days.

Zint Barcode Generator before 2.10.0 has a one-byte buffer over-read, related to is_last_single_ascii in code1.c, and rs_encode_uint in reedsol.c.

Affected products

• Zint Barcode Generator: before 2.10.0 (fixed in 2.10.0)

Published 2021-08-17. Last modified 2026-06-17.