CVE-2026-20777

Name	CVE-2026-20777
Description	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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1130889

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
biosig (PTS)	bullseye	2.1.2-4	vulnerable
	bookworm	2.5.0-1	vulnerable
	sid, trixie	3.9.0-1	vulnerable

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
biosig	source	(unstable)	(unfixed)			1130889

Notes

https://talosintelligence.com/vulnerability_reports/TALOS-2026-2362
Fixed by: https://sourceforge.net/p/biosig/code/ci/abe197c3627256ef3615a2d2f808ded069e1df4b/ (v3.9.3)