{
  "cveId": "CVE-2025-54489",
  "url": "https://patchblox.com/security/cve/CVE-2025-54489",
  "summary": "CVE-2025-54489 is fixed in biosig on 1 platform by DEBIAN-CVE-2025-54489 (version 3.9.5-1), released August 25, 2025. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "biosig: A stack-based buffer overflow vulnerability exists in the MFER parsing functionality of The Biosig Project libbiosig...",
  "description": "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:\r \r                 else if (tag==63) {\r                     uint8_t tag2=255, len2=255;\r \r                     count = 0;\r                     while ((count\u003Clen) \u0026\u0026 !(FlagInfiniteLength \u0026\u0026 len2==0 \u0026\u0026 tag2==0)){\r                         curPos \u002B= ifread(\u0026tag2,1,1,hdr);\r                         curPos \u002B= ifread(\u0026len2,1,1,hdr);\r                         if (VERBOSE_LEVEL==9)\r                             fprintf(stdout,\u0022MFER: tag=%3i chan=%2i len=%-4i tag2=%3i len2=%3i curPos=%i %li count=%4i\\n\u0022,tag,chan,len,tag2,len2,curPos,iftell(hdr),(int)count);\r \r                         if (FlagInfiniteLength \u0026\u0026 len2==0 \u0026\u0026 tag2==0) break;\r \r                         count  \u002B= (2\u002Blen2);\r                         curPos \u002B= ifread(\u0026buf,1,len2,hdr);\r \r Here, the number of bytes read is not the Data Length decoded from the current frame in the file (\u0060len\u0060) but rather is a new length contained in a single octet read from the same input file (\u0060len2\u0060). Despite this, a stack-based buffer overflow condition can still occur, as the destination buffer is still \u0060buf\u0060, which has a size of only 128 bytes, while \u0060len2\u0060 can be as large as 255.",
  "published": "2025-08-25T14:15:35Z",
  "severity": "critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00706,
  "epssPercentile": 0.53656,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "biosig",
      "release": "Debian 14",
      "fixedVersion": "3.9.5-1",
      "fix": "DEBIAN-CVE-2025-54489",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-54489",
      "released": "2025-08-25T14:15:35Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}