CVE-2026-42241

MEDIUMNVD 5.35.3—
EchelonGraph scoreMEDIUM confidence

This medium-severity CVE scores 5.3 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 81% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
5.3
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 5.3Exploit: NoneExposed: 0

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

ParquetSharp is a .NET library for reading and writing Apache Parquet files. From version 18.1.0 to before version 23.0.0.1, DecimalConverter.ReadDecimal makes a stackalloc using what might be an attacker-supplied value. If an attacker declares a decimal column with some unreasonable width, this could lead to a stack overflow. In a service environment, this would potentially take down a service. This affects applications using ParquetSharp to read untrusted Parquet files in a network service. This issue has been patched in version 23.0.0.1.

CVSS v3
5.3
EG Score
5.3(medium)
EPSS
19.1%
KEV
Not listed

Published

May 7, 2026

Last Modified

May 7, 2026

Advisory Details (2)

Auto-updated May 7, 2026
Patch available. Sources: github.
github Patch Available

Stack overflow possible when reading a Parquet file with large decimal type width · Advisory · G-Research/ParquetSharp · GitHub

https://github.com/G-Research/ParquetSharp/security/advisories/GHSA-rrjr-v56m-ww88
generic

Release ParquetSharp 23.0.0.1 · G-Research/ParquetSharp · GitHub

https://github.com/G-Research/ParquetSharp/releases/tag/23.0.0.1

Affected Packages

(1 across 1 ecosystem)
NuGet(1)
PackageVulnerable rangeFixed inDependents
ParquetSharp18.1.0 ... 23.0.0-beta1 (10 versions)23.0.0.1—

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 40× 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.

  1. 2026-07-11 08:27 UTCEPSS rescore
  2. 2026-07-09 19:10 UTCEPSS rescore
  3. 2026-07-08 15:15 UTCEPSS rescore
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  15. 2026-06-28 09:08 UTCEG score recompute
  16. 2026-06-28 04:56 UTCEPSS rescore
  17. 2026-06-27 03:08 UTCEPSS rescore
  18. 2026-06-26 22:12 UTCEG score recompute
  19. 2026-06-25 13:49 UTCEPSS rescore
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  1. 2026-06-21 14:56 UTCEPSS rescore
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  3. 2026-06-19 19:25 UTCEPSS rescore
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  7. 2026-06-17 03:25 UTCEG score recompute
  8. 2026-06-16 17:52 UTCEPSS rescore
  9. 2026-06-15 17:49 UTCEPSS rescore
  10. 2026-06-15 01:28 UTCEG score recompute
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  12. 2026-06-13 23:00 UTCEPSS rescore
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  15. 2026-06-12 12:36 UTCEG score recompute
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  18. 2026-06-10 22:18 UTCEPSS rescore
  19. 2026-06-10 17:16 UTCEG score recompute
  20. 2026-06-10 13:22 UTCEPSS rescore
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  22. 2026-06-09 19:37 UTCEG score recompute
  23. 2026-06-08 21:57 UTCEG score recompute
  24. 2026-06-08 14:17 UTCEPSS rescore
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  26. 2026-06-07 18:15 UTCEG score recompute
  27. 2026-06-07 15:25 UTCEPSS rescore
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  29. 2026-06-06 20:35 UTCEG score recompute
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  34. 2026-06-05 06:10 UTCEPSS rescore
  35. 2026-06-05 06:10 UTCEPSS rescore
  36. 2026-06-05 00:48 UTCEG score recompute
  37. 2026-06-04 13:12 UTCEPSS rescore
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  39. 2026-06-04 02:31 UTCEG score recompute
  40. 2026-06-03 04:51 UTCEG score recompute
  41. 2026-06-02 20:13 UTCEPSS rescore
  42. 2026-06-02 07:11 UTCEG score recompute
  43. 2026-06-01 13:52 UTCEPSS rescore
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  45. 2026-06-01 08:57 UTCEG score recompute
  46. 2026-05-31 22:30 UTCEPSS rescore
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  48. 2026-05-31 00:16 UTCEPSS rescore
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  50. 2026-05-29 13:44 UTCEPSS rescore
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  59. 2026-05-26 07:18 UTCEPSS rescore
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  61. 2026-05-23 00:07 UTCEG score recompute
  62. 2026-05-20 22:38 UTCEPSS rescore
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  64. 2026-05-20 13:52 UTCEG score recompute
  65. 2026-05-20 11:22 UTCEPSS rescore
  66. 2026-05-20 11:22 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-42241?
CVE-2026-42241 is a medium vulnerability published on May 7, 2026. ParquetSharp is a .NET library for reading and writing Apache Parquet files. From version 18.1.0 to before version 23.0.0.1, DecimalConverter.ReadDecimal makes a stackalloc using what might be an attacker-supplied value. If an attacker declares a decimal column with some unreasonable width, this…
When was CVE-2026-42241 disclosed?
CVE-2026-42241 was first published in the National Vulnerability Database on May 7, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-42241 actively exploited?
CVE-2026-42241 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 19.1% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-42241?
CVE-2026-42241 has a CVSS v3 base score of 5.3 (NVD).
How do I remediate CVE-2026-42241?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-42241, 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.

Dependency Blast Radius

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