CVE-2021-39247

MEDIUM 6.5CVE-2021-39247 · Published 17/08/2021 · updated 17/06/2026

In short

CVE-2021-39247 is a MEDIUM (CVSS 6.5) vulnerability affecting barcode generator (zint).
Chance of exploitation in the next 30 days (EPSS): 0.92%, higher than 60.5% of all vulnerabilities.
Fix: update to 2.10.0 or later.

Package	Affected versions	Patched versions
barcode generator zint	`< 2.10.0`	`2.10.0`

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.

Running one of these products? Scan your site to see whether it exposes a vulnerable version.