Vulnerability Database

299,688

Total vulnerabilities in the database

CVE-2025-54489

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 8970 of biosig.c on the current master branch (35a819fa), when the Tag is 63:

else if (tag==63) { uint8_t tag2=255, len2=255; count = 0; while ((count<len) && !(FlagInfiniteLength && len2==0 && tag2==0)){ curPos += ifread(&tag2,1,1,hdr); curPos += ifread(&len2,1,1,hdr); if (VERBOSE_LEVEL==9) fprintf(stdout,"MFER: tag=%3i chan=%2i len=%-4i tag2=%3i len2=%3i curPos=%i %li count=%4i\n",tag,chan,len,tag2,len2,curPos,iftell(hdr),(int)count); if (FlagInfiniteLength && len2==0 && tag2==0) break; count += (2+len2); curPos += ifread(&buf,1,len2,hdr);

Here, the number of bytes read is not the Data Length decoded from the current frame in the file (len) but rather is a new length contained in a single octet read from the same input file (len2). Despite this, a stack-based buffer overflow condition can still occur, as the destination buffer is still buf, which has a size of only 128 bytes, while len2 can be as large as 255.

  • Published: Aug 25, 2025
  • Updated: Nov 4, 2025
  • CVE: CVE-2025-54489
  • Severity: Critical
  • Exploit:

CVSS v3:

  • Severity: Critical
  • Score: 9.8
  • AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWEs:

Software From Fixed in
libbiosig_project / libbiosig - 3.9.1