CVE-2026-20777 Memory corruption in libbiosig

High 8.1 Published 3 Mar 2026 Updated 3 Mar 2026

A heap-based buffer overflow in libbiosig allows arbitrary code execution via a crafted .wft file, affecting applications using this library.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: Available

What is CVE-2026-20777?

CVE-2026-20777 is a high-severity memory corruption vulnerability in The Biosig Project libbiosig, published on 3 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

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.

Weakness: CWE-122

Which versions are affected by CVE-2026-20777?

It affects 1 product.

Products include Libbiosig Project Libbiosig.

How do I fix CVE-2026-20777?

Apply the vendor's patch.

Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.

Is CVE-2026-20777 being exploited?

There is no known exploitation of CVE-2026-20777 in the wild and no public exploit code.

Sources

Also known as DEBIAN-CVE-2026-20777, GHSA-2gq5-x5qp-v68m, UBUNTU-CVE-2026-20777.