CVE-2025-66048
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 · uneditedSeveral stack-based buffer overflow vulnerabilities exists in the MFER parsing functionality of The Biosig Project libbiosig 3.9.1. A specially crafted MFER file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger these vulnerabilities.When Tag is 133
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 · moderate confidenceStack-based buffer overflow vulnerabilities exist in the MFER file parsing code of libbiosig 3.9.1. When processing MFER files with specific Tag values (noted as Tag 133), the parser fails to perform proper bounds checking before writing data to a stack-allocated buffer, allowing an attacker-controlled file to overflow the buffer and achieve 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< 3.9.2CVSS 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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Identify installed libbiosig versionRun 'pkg-config --modversion libbiosig' or check the library file version metadata using 'strings' or 'file' on the compiled library binary, or review build/package manifests if installed via a package managerAffected if The reported version is lower than 3.9.2 (e.g., 3.9.1 or earlier)
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Confirm MFER file parsing capability is presentCheck if the libbiosig library binary contains MFER-related symbols or functions by running 'nm -g <library> | grep -i mfer' or 'objdump -T <library> | grep -i mfer'Affected if MFER parsing functions exist in the installed library binary
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Locate applications or tools that use libbiosigSearch for executables or scripts that link against libbiosig and process MFER files, using 'ldd <executable>' or checking application documentation for MFER supportAffected if Applications linked against the vulnerable libbiosig version are in use for processing MFER files
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Review MFER file processing workflowsAudit any file import or data ingestion pipelines that handle .mfer files, noting whether libbiosig is invoked to parse themAffected if MFER files are being processed by the vulnerable library version
A user is affected if their installed libbiosig version is below 3.9.2 and they process MFER files using the library, particularly files with Tag 133 constructs.
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 · scoped3.9.2
Upgrade libbiosig to the latest version containing the security patch, or implement input validation and bounds checking in the MFER parsing routines to ensure all file read operations respect buffer boundaries before processing Tag 133 and similar constructs.
libbiosig 3.9.2
- Obtain libbiosig version 3.9.2 or later from the official Biosig Project repository or distribution channel
- Replace the vulnerable libbiosig installation with the version 3.9.2 or later
- Recompile any applications that link against libbiosig to ensure they use the updated library
- Verify the new version is correctly installed by checking the library version
- Re-test the MFER parsing functionality with legitimate files to confirm proper operation
Generated from the published advisory — verify against the referenced sources before acting.
- Consultation2.0 h
- Implementation8.0 h
- Testing4.0 h
- Review / QA2.0 h
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Free · runs locallyCheck whether your project pulls in CVE-2025-66048 — 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-2025-66048 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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