CVE-2026-20777: Libbiosig Project Libbiosig

High severity, CVSS 8.1. EPSS: 0.5% chance of exploitation in the next 30 days.

A heap-based buffer overflow vulnerability exists in the Nicolet WFT parsing functionality of The Biosig Project libbiosig 3.9.2 and Master Branch (db9a9a63). A specially crafted .wft file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.

Affected products

• Libbiosig Project Libbiosig: version 3.9.2 only

Published 2026-03-03. Last modified 2026-06-17.