CVE-2018-19974: Virustotal Yara

Medium severity, CVSS 5.5. EPSS: 1.3% chance of exploitation in the next 30 days.

In YARA 3.8.1, bytecode in a specially crafted compiled rule can read uninitialized data from VM scratch memory in libyara/exec.c. This can allow attackers to discover addresses in the real stack (not the YARA virtual stack).

Affected products

• Virustotal Yara: version 3.8.1 only

Published 2018-12-17. Last modified 2026-06-17.