CVE-2025-50343Public exploitNetwork attack vector

Service crash via unchecked structure field count

Published Dec 30, 2025 · Updated Dec 30, 2025

Heap memory corruption in Mat_VarCreateStruct in matio 1.5.28 allows attackers to crash a consuming process via mismatched field counts. The function trusts nfields as the length of the fields pointer array, reads beyond a shorter array, and later frees corrupted field-name pointers during cleanup. Triggering the flaw requires a caller to pass an inconsistent array/count pair; remote reachability exists only when an embedding service constructs structures from untrusted input.

CVSS severity9.8
Critical
EPSS probability0.40%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Heap memory corruption in Mat_VarCreateStruct in matio 1.5.28 allows attackers to crash a consuming process via mismatched field counts. The function trusts nfields as the length of the fields pointer array, reads beyond a shorter array, and later frees corrupted field-name pointers during cleanup. Triggering the flaw requires a caller to pass an inconsistent array/count pair; remote reachability exists only when an embedding service constructs structures from untrusted input.

The record

CVE
CVE-2025-50343
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-122
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

9.8CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-122Heap-based Buffer Overflow

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo