CVE-2025-66046CWE-121CWE-787

CVE-2025-66046

Critical · published December 11, 2025

CVSS v3.1
9.8
EPSS
1%
Percentile
45.0
In the wild
Unconfirmed
What it is

🚨 A crafty MFER file can exploit vulnerabilities in libbiosig 3.9.1, allowing attackers to execute arbitrary code — a ticket to the digital wild west! 🔥 Think of it like a sneaky package arriving at your front door, packed with something dangerous that goes off when you unwrap it — you thought you were safe, but now your house is compromised! An attacker could send a specially crafted file that leads to arbitrary code execution on the system. This means they could take control, steal sensitive data, or even turn your machine into a puppet — the consequences are absolutely devastating!

Put simply

Think of it like a sneaky package arriving at your front door, packed with something dangerous that goes off when you unwrap it — you thought you were safe, but now your house is compromised! The vulnerabilities are caused by stack-based buffer overflows within the MFER parsing functionality of libbiosig, allowing attackers to send malicious files that exploit these flaws.

What to do

An attacker could send a specially crafted file that leads to arbitrary code execution on the system. This means they could take control, steal sensitive data, or even turn your machine into a puppet — the consequences are absolutely devastating! Immediately update libbiosig to version 3.9.2 or later to patch these vulnerabilities. If you're using this library in your applications, audit your file handling to ensure safe practices are in place. You've got this! With a quick update, you'll be reinforcing your defenses in no time! 🛡️

The record
Technical detail
CVSS v3.1
9.8 · CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CVSS v4.0
Not supplied
EPSS
0.00546 · 45.0th percentile
Weaknesses
CWE-121 · Stack-based Buffer Overflow; CWE-787 · Out-of-bounds Write
Published
2025-12-11T22:15Z
Affected products (1)
ProductVersionsFixed in
libbiosig_project/libbiosig< 3.9.23.9.2
References (2)
EPSS history
Timeline
  • 11 DEC 16:43Z
    Several stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1
    cvelistv5