CVE-2021-27799: Zint Barcode Generator

High severity, CVSS 7.5. EPSS: 2.4% chance of exploitation in the next 30 days.

ean_leading_zeroes in backend/upcean.c in Zint Barcode Generator 2.9.1 has a stack-based buffer overflow that is reachable from the C API through an application that includes the Zint Barcode Generator library code.

Affected products

• Zint Barcode Generator: version 2.9.1 only

Published 2021-02-26. Last modified 2026-06-17.