CVE-2021-3402: Fedoraproject Fedora

Critical severity, CVSS 9.1. EPSS: 2.2% chance of exploitation in the next 30 days.

An integer overflow and several buffer overflow reads in libyara/modules/macho/macho.c in YARA v4.0.3 and earlier could allow an attacker to either cause denial of service or information disclosure via a malicious Mach-O file. Affects all versions before libyara 4.0.4

Affected products

• Fedoraproject Fedora: version 33 only; version 34 only
• Virustotal Yara: before 4.0.4 (fixed in 4.0.4)

Published 2021-05-14. Last modified 2026-06-17.