{"id":"DEBIAN-CVE-2025-54481","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 8744 of biosig.c on the current master branch (35a819fa), when the Tag is 3:\r \r \t\t\t\telse if (tag==3) {\r \t\t\t\t\t// character code\r \t\t\t\t\tchar v[17];\t\t// [1]\r \t\t\t\t\tif (len\u003e16) fprintf(stderr,\"Warning MFER tag2 incorrect length %i\u003e16\\n\",len);\r \t\t\t\t\tcurPos += ifread(&v,1,len,hdr);\r \t\t\t\t\tv[len]  = 0;\r \r 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.","modified":"2026-09-01T20:05:54.636202774Z","published":"2025-08-25T14:15:33.700Z","upstream":["CVE-2025-54481"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2025-54481"}],"affected":[{"package":{"name":"biosig","ecosystem":"Debian:12","purl":"pkg:deb/debian/biosig?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0-1","2.5.2-1","2.5.2-2","2.6.0-1","2.6.1-1","3.9.0-1","3.9.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-54481.json"}},{"package":{"name":"biosig","ecosystem":"Debian:13","purl":"pkg:deb/debian/biosig?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.0-1","3.9.5-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-54481.json"}},{"package":{"name":"biosig","ecosystem":"Debian:14","purl":"pkg:deb/debian/biosig?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"3.9.5-1"}]}],"versions":["3.9.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2025-54481.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}]}