CVE-2025-50343
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 · uneditedAn issue was discovered in matio 1.5.28. A heap-based memory corruption can occur in Mat_VarCreateStruct() when the nfields value does not match the actual number of strings in the fields array. This leads to out-of-bounds reads and invalid memory frees during cleanup, potentially causing a segmentation fault or heap corruption.
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 confidenceIn matio 1.5.28, the Mat_VarCreateStruct() function suffers from a heap-based memory corruption vulnerability when the nfields parameter does not match the actual number of strings provided in the fields array. This mismatch causes out-of-bounds memory reads during field access and leads to invalid memory frees during cleanup, potentially resulting in segmentation faults or heap corruption.
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= 1.5.28CVSS 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 matio library installationRun 'pkg-config --modversion matio' or check your package manager for installed matio packagesAffected if The installed version is 1.5.28
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Locate Mat_VarCreateStruct usageSearch source code repositories for calls to Mat_VarCreateStruct function (e.g., grep -r 'Mat_VarCreateStruct' /path/to/code)Affected if Code calls Mat_VarCreateStruct and the nfields argument may not match the actual number of elements in the fields array
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Inspect nfields parameter alignmentReview each call site of Mat_VarCreateStruct and verify that the nfields value equals the actual count of field name strings passed in the fields parameterAffected if Any call site passes an nfields value that differs from the number of field name strings in the fields array
You are affected if matio version 1.5.28 is installed AND your code uses Mat_VarCreateStruct with a nfields parameter that does not match the actual number of field name strings provided.
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 dataUpgrade to a patched version of matio once available. As an immediate workaround, ensure any code calling Mat_VarCreateStruct() validates that the nfields count exactly matches the fields array size before invocation.
- Consultation3.0 h
- Implementation6.0 h
- Testing5.0 h
- Review / QA3.0 h
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Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2025-50343 — 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-2025-50343 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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