CVE-2025-54482
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedA 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 8751 of biosig.c on the current master branch (35a819fa), when the Tag is 4: else if (tag==4) { // SPR if (len>4) fprintf(stderr,"Warning MFER tag4 incorrect length %i>4\n",len); curPos += ifread(buf,1,len,hdr);
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · high confidenceA stack-based buffer overflow exists in libbiosig's MFER file parser at line 8751 of biosig.c. When processing MFER files with Tag=4, the code reads a length value from the file and passes it directly to ifread() without validating it against the buffer size, allowing controlled overflow and potential arbitrary code execution.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data< 3.9.1CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Network
- Complexity
- Low
- Privileges
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Check libbiosig library versionRun 'pkg-config --modversion libbiosig' or check the library file with 'strings libbiosig.so | grep -i version' to find the installed version numberAffected if The version is lower than 3.9.1
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Identify MFER file processing in your applicationSearch your codebase for calls to biosig_open() or biosig() functions with MFER files, or grep for 'MFER' in your application's file handling codeAffected if Your application or service processes MFER files using libbiosig
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Verify MFER Tag=4 parsing path existsInspect the compiled libbiosig library or source code at biosig.c line 8751 to confirm the ifread() call without bounds checking is present for Tag=4 handlingAffected if The vulnerable ifread() call without len validation is present in the build
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Check for MFER input sourcesReview your application logs, file processing pipelines, or user upload handling to identify if MFER files (medical waveform format) are accepted as inputAffected if Your environment accepts MFER files as input for processing through libbiosig
Your environment is affected if you use libbiosig version below 3.9.1 and process MFER files, especially files with Tag=4 records, through the vulnerable biosig.c parser.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
dbcve · scoped3.9.1
Update libbiosig to a patched version that adds proper bounds checking on the len parameter before the ifread() call at line 8751, or implement input validation to reject MFER files where len exceeds the buffer allocation.
Libbiosig 3.9.1
- Obtain libbiosig version 3.9.1 or later from the official source (https://biosig.sourceforge.net/ or the project repository)
- Replace the existing libbiosig installation with version 3.9.1
- Rebuild any applications that link against libbiosig to ensure they use the updated library
- Verify the upgrade by checking the library version (e.g., using biosig_version() or similar API function)
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation3.0 h
- Testing3.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-54482 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2025-54482 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Version or environment caveats, and links to real fixes
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