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Vulnerability · Published Mar 3, 2026 · Assigned by talos

CVE-2026-20777

High 8.1

In plain English

A high-severity heap buffer overflow in libbiosig from The Biosig Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.6% (higher than 48% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.6%top 51.8% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Debian:12biosigno fix listedDEBIAN-CVE-2026-20777
Debian:13biosigno fix listedDEBIAN-CVE-2026-20777
Debian:14biosig3.9.5-1DEBIAN-CVE-2026-20777
Ubuntu:25.10biosigno fix listedUBUNTU-CVE-2026-20777

Affected products (as reported)

VendorProductVersions
The Biosig Project libbiosig 3.9.2Master Branch (db9a9a63)

Weakness: CWE-122 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

References