{"id":"CVE-2025-54490","details":"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 9090 of biosig.c on the current master branch (35a819fa), when the Tag is 64:\r\n\r\n                else if (tag==64)     //0x40\r\n                {\r\n                    // preamble\r\n                    char tmp[256];  // [1]\r\n                    curPos += ifread(tmp,1,len,hdr);\r\n\r\nIn this case, the overflowed buffer is the newly-declared `tmp` \\[1\\] instead of `buf`. While `tmp` is larger than `buf`, having a size of 256 bytes, a stack overflow can still occur in cases where `len` is encoded using multiple octets and is greater than 256.","modified":"2026-04-10T05:29:36.697152Z","published":"2025-08-25T14:15:35.420Z","references":[{"type":"WEB","url":"https://www.talosintelligence.com/vulnerability_reports/TALOS-2025-2234"},{"type":"EVIDENCE","url":"https://talosintelligence.com/vulnerability_reports/TALOS-2025-2234"}],"affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-54490.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"3.9.1"}]}]}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}