CVE-2026-42241 — Vulnerability in ParquetSharp — CVE Details

MEDIUM

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

Published April 24, 2026Updated May 11, 2026Source: osv

Summary

`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.

Advisory Timeline

First published April 24, 2026 (171 days ago).
Last revised May 11, 2026 — 17 days after initial publication.

Remediation

Upgrade to the fixed version using your package manager.

NuGet

Update ParquetSharp to 23.0.0.1 or later

dotnet add package ParquetSharp --version 23.0.0.1

After upgrading, run your dependency scanner again to confirm the vulnerability is resolved.

Affected Packages (1)

Affects 1 ecosystem: nuget (1).

Package	Ecosystem	Affected	Fixed In
ParquetSharp	nuget	18.1.0, 19.0.1, 19.0.1-beta1, 20.0.0 (+6 more)	23.0.0.1

Vulnerability Classification

Common Weakness Enumeration (CWE) identifiers for this vulnerability type.

CWE-789
View on MITRE

CVSS Score Breakdown

What the CVSS (Common Vulnerability Scoring System) 5.3 score means for each attack dimension.

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

Low

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Frequently Asked Questions

What is CVE-2026-42241?: ParquetSharp: Possible Stack Overflow When Reading a ParquetFile with Large Decimal Type Width This vulnerability has been assigned a severity rating of MEDIUM (CVSS score: 5.3/10).
How do I check if my project is affected by CVE-2026-42241?: CVE-2026-42241 affects ParquetSharp. Use GeekWala's free vulnerability scanner to check your dependencies against CVE-2026-42241 and 200,000+ other known vulnerabilities.

Severity & Exploitability

CVSS Score

5.3

Exploitation requires specific conditions or has limited impact. Remediate within weeks.

Also Known As

GHSA-rrjr-v56m-ww88

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