How severe is CVE-2025-50343?

CVE-2025-50343 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2025-50343 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-50343?

CVE-2025-50343 affects Matio Project Matio. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-50343?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2025-50343 have an EU (EUVD) identifier?

Yes. CVE-2025-50343 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205846.

When was CVE-2025-50343 published?

CVE-2025-50343 was published on 2025-12-30 and last updated on 2026-06-17.

CVE-2025-50343

CVE-2025-50343 is a critical-severity vulnerability in Matio Project Matio with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-122.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
EPSS exploit prediction: 0% (26th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-205846
Weakness: CWE-122
Affected product: Matio Project Matio
Published: 2025-12-30
Last modified: 2026-06-17

Description

An 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.

Frequently asked questions

What is CVE-2025-50343?: An 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.
How severe is CVE-2025-50343?: CVE-2025-50343 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2025-50343 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (26th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-50343?: CVE-2025-50343 affects Matio Project Matio. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-50343?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2025-50343 have an EU (EUVD) identifier?: Yes. CVE-2025-50343 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-205846.
When was CVE-2025-50343 published?: CVE-2025-50343 was published on 2025-12-30 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:matio_project:matio:1.5.28:*:*:*:*:*:*:*

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