CVE-2025-66044 Memory corruption in libbiosig
A stack-based buffer overflow in libbiosig allows arbitrary code execution via a specially crafted MFER file.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2025-66044?
CVE-2025-66044 is a critical memory corruption vulnerability in The Biosig Project libbiosig, published on 11 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Several stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1. A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger these vulnerabilities.When Tag is 64
Which versions are affected by CVE-2025-66044?
It affects 1 product.
Products include Libbiosig Project Libbiosig.
How do I fix CVE-2025-66044?
Upgrade to a fixed version.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2025-66044 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-66044 exists.
Other vulnerabilities in The Biosig Project libbiosig
Sources
Also known as DEBIAN-CVE-2025-66044, GHSA-hh9q-f437-jrxh, UBUNTU-CVE-2025-66044.