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TI-2026-30561 Aliases CVE-2026-42241GHSA-rrjr-v56m-ww88

ParquetSharp: Possible Stack Overflow When Reading a ParquetFile with Large Decimal Type Width

Priority LOW 30CWE-789Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · Low
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-789.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00273 19th percentileScored 2026-11-07
Fix Fixed ParquetSharp (G-Research): 23.0.0.1ParquetSharp (NuGet): 23.0.0.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
G-ResearchParquetSharp18.1.0 to before 23.0.0.123.0.0.1Patch availableCNA
—ParquetSharp (NuGet)18.1.0 to before 23.0.0.123.0.0.1Patch availableGHSA-rrjr-v56m-ww88
  • ParquetSharp VendorG-Research Affected 18.1.0 to before 23.0.0.1 Fixed in 23.0.0.1 Patch available CNA
  • ParquetSharp (NuGet) Vendor— Affected 18.1.0 to before 23.0.0.1 Fixed in 23.0.0.1 Patch available GHSA-rrjr-v56m-ww88

Remediation

  • Fix · CNA ParquetSharp (G-Research) Fixed in 23.0.0.1
  • Fix · GHSA-rrjr-v56m-ww88 ParquetSharp (NuGet) Fixed in 23.0.0.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-42241
  2. 2026-10-03 Alias added: GHSA-rrjr-v56m-ww88

References

Advisory 1

Other 3

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences