What is CVE-2026-20777?

CVE-2026-20777 is a high-severity vulnerability in Libbiosig Project, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-03-03.

How severe is CVE-2026-20777?

High severity. CVSS v3 base score is 8.1 out of 10.

Buffer overflow in Libbiosig Project

CVE-2026-20777

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.

Vulnerability class: Buffer Overflow

EPSS: 0.005 (40.6th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.1 (High). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H.

Affected products

Libbiosig_project Libbiosig — versions 3.9.2
The Biosig Project Libbiosig — versions 3.9.2, Master Branch (db9a9a63)

Weakness classification (CWE)

CWE-122 — Heap-based Buffer Overflow

References

talos-cna@cisco.com (Exploit, Third Party Advisory)
af854a3a-2127-422b-91ae-364da2661108 (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2026-20777?: CVE-2026-20777 is a high-severity vulnerability in Libbiosig Project, classified under Heap-based Buffer Overflow. CVSS score: 8.1/10. Published 2026-03-03.
How severe is CVE-2026-20777?: High severity. CVSS v3 base score is 8.1 out of 10.