CVE-2025-50343

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2025-12-30. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 9.8Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
75(Attend)
EG Risk 75/100SSVC: Attend

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation40% × 40%
Automatability100% × 15%
Action: Remediate soon — notable exploitation risk.
EPSS PROB
0%
EPSS %ILE
34%
KEV
Not listed

Published

December 30, 2025

Last Modified

January 9, 2026

Advisory Details (2)

Auto-updated Sep 17, 2026
No patch confirmed yet.
generic

POC/matio/CVE-2025-50343/matio.md at main · zakkanijia/POC · GitHub

https://github.com/zakkanijia/POC/blob/main/matio/CVE-2025-50343/matio.md
generic

Heap-based invalid free in Mat_VarCreateStruct() · Issue #275 · tbeu/matio · GitHub

https://github.com/tbeu/matio/issues/275

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
libmatio1.5.19-21.5.19-2+deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
libmatio1.5.23-21.5.23-2+deb12u1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
libmatio1.5.28-2 ... 1.6.0-1 (7 versions)——
Debian:14(1)
PackageVulnerable rangeFixed inDependents
libmatio1.5.28-2, 1.5.29-1, 1.5.30-11.5.30-2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 32× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 166 total refreshes for this CVE.

  1. 2026-09-20 20:15 UTCEPSS rescore
  2. 2026-09-20 20:15 UTCEPSS rescore
  3. 2026-09-19 20:33 UTCOSV refresh
  4. 2026-09-19 15:42 UTCEPSS rescore
  5. 2026-09-18 19:27 UTCEPSS rescore
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  7. 2026-09-17 19:29 UTCEPSS rescore
  8. 2026-09-16 14:07 UTCEPSS rescore
  9. 2026-09-16 05:14 UTCEPSS rescore
  10. 2026-09-13 16:46 UTCEPSS rescore
  11. 2026-09-12 15:00 UTCEPSS rescore
  12. 2026-09-11 14:52 UTCEPSS rescore
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  15. 2026-09-08 21:59 UTCEPSS rescore
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  20. 2026-09-02 14:11 UTCEPSS rescore
  21. 2026-09-01 13:53 UTCEPSS rescore
  22. 2026-09-01 04:38 UTCEPSS rescore
  23. 2026-09-01 00:04 UTCOSV refresh
  24. 2026-08-30 19:16 UTCEPSS rescore
  25. 2026-08-30 01:21 UTCEPSS rescore
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  1. 2026-08-28 21:40 UTCEPSS rescore
  2. 2026-08-27 14:24 UTCEPSS rescore
  3. 2026-08-26 14:45 UTCEPSS rescore
  4. 2026-08-25 13:48 UTCEPSS rescore
  5. 2026-08-24 14:16 UTCEPSS rescore
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  15. 2026-08-15 01:29 UTCEPSS rescore
  16. 2026-08-15 00:35 UTCEG score recompute
  17. 2026-08-15 00:35 UTCGHSA enrichment
  18. 2026-08-13 21:59 UTCEPSS rescore
  19. 2026-08-12 13:50 UTCEPSS rescore
  20. 2026-08-11 13:41 UTCEPSS rescore
  21. 2026-08-10 23:59 UTCEPSS rescore
  22. 2026-08-09 22:17 UTCEG score recompute
  23. 2026-08-09 22:17 UTCGHSA enrichment
  24. 2026-08-09 13:46 UTCEPSS rescore
  25. 2026-08-08 16:36 UTCEPSS rescore
  26. 2026-08-08 08:39 UTCGHSA enrichment
  27. 2026-08-08 04:29 UTCEG score recompute
  28. 2026-08-08 04:29 UTCGHSA enrichment
  29. 2026-08-06 13:46 UTCEPSS rescore
  30. 2026-08-06 06:39 UTCEG score recompute
  31. 2026-08-06 06:39 UTCGHSA enrichment
  32. 2026-08-05 19:16 UTCEPSS rescore
  33. 2026-08-04 15:09 UTCEPSS rescore
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  38. 2026-07-30 16:27 UTCEPSS rescore
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  40. 2026-07-30 01:30 UTCEPSS rescore
  41. 2026-07-28 15:35 UTCEPSS rescore
  42. 2026-07-26 14:54 UTCEPSS rescore
  43. 2026-07-25 14:17 UTCEPSS rescore
  44. 2026-07-25 14:17 UTCEPSS rescore
  45. 2026-07-24 14:17 UTCEPSS rescore
  46. 2026-07-23 14:18 UTCEPSS rescore
  47. 2026-07-23 11:49 UTCOSV refresh
  48. 2026-07-23 02:57 UTCEG score recompute
  49. 2026-07-22 14:07 UTCEPSS rescore
  50. 2026-07-22 14:07 UTCEPSS rescore
  51. 2026-07-21 15:24 UTCEPSS rescore
  52. 2026-07-20 17:07 UTCEPSS rescore
  53. 2026-07-19 14:30 UTCEPSS rescore
  54. 2026-07-19 14:30 UTCEPSS rescore
  55. 2026-07-19 02:28 UTCEPSS rescore
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  57. 2026-07-18 10:04 UTCEPSS rescore
  58. 2026-07-16 17:02 UTCEPSS rescore
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  60. 2026-07-15 16:57 UTCEPSS rescore
  61. 2026-07-15 16:57 UTCEPSS rescore
  62. 2026-07-15 01:59 UTCEPSS rescore
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  64. 2026-07-13 22:29 UTCEPSS rescore
  65. 2026-07-13 22:29 UTCEPSS rescore
  66. 2026-07-13 06:12 UTCEPSS rescore
  67. 2026-07-12 05:46 UTCEPSS rescore
  68. 2026-07-11 08:27 UTCEPSS rescore
  69. 2026-07-11 08:27 UTCEPSS rescore
  70. 2026-07-09 19:09 UTCEPSS rescore
  71. 2026-07-09 19:09 UTCEPSS rescore
  72. 2026-07-08 15:15 UTCEPSS rescore
  73. 2026-07-07 13:45 UTCEPSS rescore
  74. 2026-07-06 16:27 UTCEPSS rescore
  75. 2026-07-06 16:27 UTCEPSS rescore

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-50343?
CVE-2025-50343 is a critical vulnerability published on December 30, 2025. 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…
When was CVE-2025-50343 disclosed?
CVE-2025-50343 was first published in the National Vulnerability Database on December 30, 2025, with the most recent update on January 9, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-50343 actively exploited?
CVE-2025-50343 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 65.8% of all scored CVEs.
What is the CVSS score of CVE-2025-50343?
CVE-2025-50343 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2025-50343?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-50343, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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