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

Summaryinfo

A vulnerability marked as critical has been reported in Biosig libbiosig 3.9.0. Affected by this issue is some unknown functionality of the file biosig.c of the component MFER Parser. The manipulation leads to stack-based overflow. This vulnerability is documented as CVE-2025-54486. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Biosig libbiosig 3.9.0. This issue affects an unknown code of the file biosig.c 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. The summary by CVE is:

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 8824 of biosig.c on the current master branch (35a819fa), when the Tag is 11: else if (tag==11) //0x0B { // Fs if (len>6) fprintf(stderr,"Warning MFER tag11 incorrect length %i>6\n",len); double fval; curPos += ifread(buf,1,len,hdr);

It is possible to read the advisory at talosintelligence.com. The identification of this vulnerability is CVE-2025-54486 since 07/23/2025. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 09/02/2025).

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

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Productinfo

Vendor

• Biosig

Name

• libbiosig

Version

• 3.9.0

CPE 2.3info

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CPE 2.2info

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