CVE-2025-53853
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 heap-based buffer overflow vulnerability exists in the ISHNE parsing functionality of The Biosig Project libbiosig 3.9.0 and Master Branch (35a819fa). A specially crafted ISHNE ECG annotations file can lead to arbitrary code execution. An attacker can provide a malicious file to trigger this vulnerability.
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 heap-based buffer overflow exists in libbiosig's ISHNE ECG annotation file parser. The parser fails to properly validate bounds when processing malformed ISHNE file data, allowing an attacker-controlled write beyond allocated heap memory boundaries, leading to 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= 3.9.0CVSS 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 metadata with 'strings' or 'file' on the installed libbiosig binary. Check header files if compiled from source.Affected if The installed version is exactly 3.9.0
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Determine if ISHNE parser is availableCheck for the presence of ISHNE-related functions or modules in the libbiosig installation. Look for files or symbols containing 'ISHNE' using 'nm -g libbiosig.so' or 'ldd' listing.Affected if ISHNE parser functions are linked and available in the environment
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Verify ISHNE file processing capabilityInspect the application or workflow that uses libbiosig. Check if the code loads ISHNE files via functions like sopen, or check configuration for file type support.Affected if The system is capable of parsing ISHNE ECG annotation files
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Check for untrusted ISHNE file inputAudit logs, file processing pipelines, or applications that accept ISHNE files from external or untrusted sources. Search for recent ISHNE file imports.Affected if ISHNE files from untrusted or external sources are being processed by the libbiosig library
A system is affected if it runs libbiosig version 3.9.0 and processes ISHNE ECG annotation files, especially from untrusted sources, enabling the heap overflow to trigger during malformed file parsing.
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.
From vendor dataUpdate libbiosig to a patched version that implements proper bounds checking in the ISHNE parser, or sanitize/discard untrusted ISHNE files before processing.
- Consultation4.0 h
- Implementation8.0 h
- Testing6.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-53853 — 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-2025-53853 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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