TI-2025-34287 Aliases CVE-2025-54490 GHSA-fq33-769w-5p63

Stack-based buffer overflow in Biosig Project libbiosig

MEDIUM 50CWE-121Published 2025-08-25 · Updated 2025-11-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: No fix listed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA. Impact type from CWE-121 and the CVSS impact.

Summary

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 9090 of biosig.c on the current master branch (35a819fa), when the Tag is 64: else if (tag==64) //0x40 { // preamble char tmp[256]; // [1] curPos += ifread(tmp,1,len,hdr); In this case, the overflowed buffer is the newly-declared `tmp` \[1\] instead of `buf`. While `tmp` is larger than `buf`, having a size of 256 bytes, a stack overflow can still occur in cases where `len` is encoded using multiple octets and is greater than 256.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00682 52nd percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
The Biosig Project	libbiosig	3.9.0; Master Branch (35a819fa)	—	No fix listed	CNA

libbiosig VendorThe Biosig Project Affected 3.9.0; Master Branch (35a819fa) Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:libbiosig_project:libbiosig::::::::	before 3.9.1	Vulnerable	The Biosig Project

cpe:2.3:a:libbiosig_project:libbiosig:*:*:*:*:*:*:*:* Versions before 3.9.1 Vulnerable ·The Biosig Project

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2025-54490
2026-10-03 Alias added: GHSA-fq33-769w-5p63

References

Exploit 1

https://talosintelligence.com/vulnerability_reports/TALOS-2025-2234

TI-2025-40573 Stack-based buffer overflow in Biosig Project libbiosig CVSS 3.1CRITICAL 9.8
TI-2025-40572 Stack-based buffer overflow in Biosig Project libbiosig CVSS 3.1CRITICAL 9.8
TI-2025-40571 Stack-based buffer overflow in Biosig Project libbiosig CVSS 3.1CRITICAL 9.8
TI-2025-40570 Stack-based buffer overflow in Biosig Project libbiosig CVSS 3.1CRITICAL 9.8
TI-2025-40569 Stack-based buffer overflow in Biosig Project libbiosig CVSS 3.1CRITICAL 9.8
TI-2025-40568 Stack-based buffer overflow in Biosig Project libbiosig CVSS 3.1CRITICAL 9.8

See all 40 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences