CVE-2025-53557 Memory corruption in libbiosig

Critical 9.8 Published 25 Aug 2025 Updated 3 Nov 2025

A heap-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-2025-53557?

CVE-2025-53557 is a critical memory corruption vulnerability in The Biosig Project libbiosig, published on 25 Aug 2025. 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 MFER parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted MFER 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-2025-53557?

It affects 1 product.

Products include Libbiosig Project Libbiosig.

How do I fix CVE-2025-53557?

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-2025-53557 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2025-53557 exists.

Sources

Also known as DEBIAN-CVE-2025-53557, GHSA-57h3-858x-52wq, UBUNTU-CVE-2025-53557.