Vulnerability · Published Aug 25, 2025 · Assigned by talos
CVE-2025-54492
Critical 9.8
In plain English
A critical-severity stack buffer overflow in libbiosig from The Biosig Project. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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 9141 of biosig.c on the current master branch (35a819fa), when the Tag is 67: else if (tag==67) //0x43: Sample skew { int skew=0; // [1] curPos += ifread(&skew, 1, len,hdr); In this case, the address of the newly-defined integer `skew` \[1\] is overflowed instead of `buf`. This means a stack overflow can occur using much smaller values of `len` in this code path.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | biosig | no fix listed | DEBIAN-CVE-2025-54492 |
| Debian:13 | biosig | no fix listed | DEBIAN-CVE-2025-54492 |
| Debian:14 | biosig | 3.9.5-1 | DEBIAN-CVE-2025-54492 |
| Ubuntu:25.10 | biosig | no fix listed | UBUNTU-CVE-2025-54492 |
| Ubuntu:26.10 | biosig | no fix listed | UBUNTU-CVE-2025-54492 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| The Biosig Project | libbiosig | 3.9.0Master Branch (35a819fa) |
Weakness: CWE-121 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H