Biosig libbiosig 3.9.1 MFER Parser stack-based overflow

Summaryinfo

A vulnerability classified as critical was found in Biosig libbiosig 3.9.1. Affected is an unknown function of the component MFER Parser. Such manipulation leads to stack-based overflow. This vulnerability is uniquely identified as CVE-2025-66048. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability, which was classified as very critical, has been found in Biosig libbiosig 3.9.1. Affected by this issue is an unknown function of the component MFER Parser. The manipulation with an unknown input leads to a stack-based overflow vulnerability. Using CWE to declare the problem leads to 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). Impacted is confidentiality, integrity, and availability. CVE summarizes:

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 133

The advisory is shared for download at talosintelligence.com. This vulnerability is handled as CVE-2025-66048 since 11/21/2025. The exploitation is known to be easy. The attack may be launched remotely. No form of authentication is required for exploitation. There are neither technical details nor an exploit publicly available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 12/14/2025).

The vulnerability scanner Nessus provides a plugin with the ID 278430 (Linux Distros Unpatched Vulnerability : CVE-2025-66048), 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 vulnerability database at Tenable (278430). Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• Biosig

Name

• libbiosig

Version

• 3.9.1

CPE 2.3info

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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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