{"id":"UBUNTU-CVE-2025-54489","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 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\u003clen) && !(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.","modified":"2026-09-02T19:35:23.623579289Z","published":"2025-08-25T14:15:00Z","upstream":["CVE-2025-54489"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-54489"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2025-54489"},{"type":"REPORT","url":"https://sourceforge.net/p/biosig/mailman/message/59224259/"},{"type":"REPORT","url":"https://talosintelligence.com/vulnerability_reports/TALOS-2025-2234"}],"affected":[{"package":{"name":"biosig","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/biosig?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.1.2-4","2.1.2-4build1","2.1.2-4build2","2.3.3-1","2.3.3-1build1","2.3.3-1build2","2.3.3-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"biosig-tools","binary_version":"2.3.3-1ubuntu0.1~esm1"},{"binary_version":"2.3.3-1ubuntu0.1~esm1","binary_name":"libbiosig3"},{"binary_name":"octave-biosig","binary_version":"2.3.3-1ubuntu0.1~esm1"},{"binary_name":"python3-biosig","binary_version":"2.3.3-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54489.json"}},{"package":{"name":"biosig","ecosystem":"Ubuntu:Pro:24.04:LTS","purl":"pkg:deb/ubuntu/biosig?arch=source&distro=esm-apps%2Fnoble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.5.0-1build2","2.5.2-1","2.5.2-1build1","2.5.2-2","2.6.0-1","2.6.0-1build1","2.6.0-1ubuntu1","2.6.0-1ubuntu1+esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"biosig-tools","binary_version":"2.6.0-1ubuntu1+esm1"},{"binary_name":"libbiosig3","binary_version":"2.6.0-1ubuntu1+esm1"},{"binary_name":"octave-biosig","binary_version":"2.6.0-1ubuntu1+esm1"},{"binary_name":"python3-biosig","binary_version":"2.6.0-1ubuntu1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54489.json"}},{"package":{"name":"biosig","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/biosig?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.6.1-1build3","3.9.0-1"],"ecosystem_specific":{"binaries":[{"binary_name":"biosig-tools","binary_version":"3.9.0-1"},{"binary_version":"3.9.0-1","binary_name":"libbiosig3"},{"binary_name":"octave-biosig","binary_version":"3.9.0-1"},{"binary_name":"python3-biosig","binary_version":"3.9.0-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54489.json"}},{"package":{"name":"biosig","ecosystem":"Ubuntu:Pro:26.04:LTS","purl":"pkg:deb/ubuntu/biosig?arch=source&distro=esm-apps%2Fresolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.9.0-1","3.9.0-1build1","3.9.0-1build2","3.9.0-1build3","3.9.0-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"biosig-tools","binary_version":"3.9.0-1ubuntu0.1~esm1"},{"binary_name":"libbiosig3","binary_version":"3.9.0-1ubuntu0.1~esm1"},{"binary_name":"octave-biosig","binary_version":"3.9.0-1ubuntu0.1~esm1"},{"binary_name":"python3-biosig","binary_version":"3.9.0-1ubuntu0.1~esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2025/UBUNTU-CVE-2025-54489.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"},{"type":"Ubuntu","score":"medium"}]}