PatchTheCVECVE-2025-54491: A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project lib
CVE-2025-54491 is a critical-severity flaw (CVSS 9.8) affecting libbiosig. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
A stack-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.This vulnerability manifests on line 9191 of biosig.c on the current master branch (35a819fa), when the Tag is 65: else if (tag==65) //
Why this priority
- Critical severity
- Public exploit reference
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 9.8 (Critical) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.7% (top 48%) |
| CISA exploited list | No |
| Weakness | CWE-121 |
| Published | 2025-08-25 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2025-54491?
libbiosig: upgrade to 3.9.1. Exact commands for each OS are on this page.
Is CVE-2025-54491 being exploited?
CVE-2025-54491 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2025-54491 affect?
CVE-2025-54491 affects libbiosig. Severity is critical (CVSS 9.8). A stack-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 pro
How urgent is CVE-2025-54491?
Priority 57/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action
Related CVEs
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- CVE-2026-20777 HIGH 8.1 DOWNGRADE A heap-based buffer overflow vulnerability exists in the Nicolet WFT parsing functionality of The Biosig Proje
- CVE-2025-64736 MEDIUM 6.1 DOWNGRADE An out-of-bounds read vulnerability exists in the ABF parsing functionality of The Biosig Project libbiosig 3.
- CVE-2025-54494 CRITICAL 9.8 UPGRADE A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project lib
- CVE-2025-54493 CRITICAL 9.8 UPGRADE A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project lib