Biosig libbiosig 3.9.0 MFER Parser biosig.c stack-based overflow

Summaryinfo

A vulnerability, which was classified as critical, was found in Biosig libbiosig 3.9.0. The affected element is an unknown function of the file biosig.c of the component MFER Parser. Executing a manipulation can lead to stack-based overflow. This vulnerability is handled as CVE-2025-54491. The attack can be executed remotely. There is not any exploit available.

Detailsinfo

A vulnerability was found in Biosig libbiosig 3.9.0. It has been declared as critical. This vulnerability affects some unknown functionality of the file biosig.c of the component MFER Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. The CWE definition for the vulnerability is CWE-121. A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function). As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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) //0x41: patient event { // event table curPos += ifread(buf,1,len,hdr);

The advisory is shared for download at talosintelligence.com. This vulnerability was named CVE-2025-54491 since 07/23/2025. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 09/03/2025).

The vulnerability scanner Nessus provides a plugin with the ID 260409 (Linux Distros Unpatched Vulnerability : CVE-2025-54491), which helps to determine the existence of the flaw in a target environment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

The vulnerability is also documented in the databases at Tenable (260409) and EUVD (EUVD-2025-25672). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Biosig

Name

• libbiosig

Version

• 3.9.0

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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