CVE-2025-54481

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 8744 of biosig.c on the current master branch (35a819fa), when the Tag is 3:

            else if (tag==3) {
                // character code
                char v[17];     // [1]
                if (len>16) fprintf(stderr,"Warning MFER tag2 incorrect length %i>16\n",len);
                curPos += ifread(&v,1,len,hdr);
                v[len]  = 0;

In this case, the overflowed buffer is the newly-declared v [1] instead of buf. Since v is only 17 bytes large, much smaller values of len (even those encoded using a single octet) can trigger an overflow in this code path.

References

Affected packages

Git /

Affected ranges

Database specific

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "fixed": "3.9.1"
            }
        ]
    }
]

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-54481.json"