Vulnerability · Published Dec 11, 2025 · Assigned by talos
CVE-2025-66046
Critical 9.8
In plain English
A critical-severity stack buffer overflow in libbiosig from The Biosig Project. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 46% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)9.8Critical
Exploit odds (30 days)0.5%top 54.1% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
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 67
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | biosig | no fix listed | DEBIAN-CVE-2025-66046 |
| Debian:13 | biosig | no fix listed | DEBIAN-CVE-2025-66046 |
| Debian:14 | biosig | 3.9.5-1 | DEBIAN-CVE-2025-66046 |
| Ubuntu:25.10 | biosig | no fix listed | UBUNTU-CVE-2025-66046 |
| Ubuntu:26.10 | biosig | no fix listed | UBUNTU-CVE-2025-66046 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Biosig Project | libbiosig | 3.9.1 |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H