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CVE-2026-42241— ParquetSharp: Possible Stack Overflow When Reading a ParquetFile with Large Decimal Type Width

Quick assessment

Affected
G-Research ParquetSharp
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ParquetSharp是G-Research开源的一款跨平台读写Parquet文件的.NET库。 ParquetSharp 18.1.0版本至23.0.0.1之前版本存在安全漏洞，该漏洞源于DecimalConverter.ReadDecimal使用攻击者可能提供的值进行stackalloc，可能导致堆栈溢出，在服务环境中可能导致服务中断。

CVSS 5.3 · Medium EPSS 0.45% · P38

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
G-Research ParquetSharp >= 18.1.0, < 23.0.0.1 affected
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I. Basic Information for CVE-2026-42241

Vulnerability Information
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Vulnerability Title
ParquetSharp: Possible Stack Overflow When Reading a ParquetFile with Large Decimal Type Width
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的内存分配
Source: CVE Program / CVE List V5
Vulnerability Title
ParquetSharp 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ParquetSharp是G-Research开源的一款跨平台读写Parquet文件的.NET库。 ParquetSharp 18.1.0版本至23.0.0.1之前版本存在安全漏洞，该漏洞源于DecimalConverter.ReadDecimal使用攻击者可能提供的值进行stackalloc，可能导致堆栈溢出，在服务环境中可能导致服务中断。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
G-Research ParquetSharp >= 18.1.0, < 23.0.0.1 -

II. Public POCs for CVE-2026-42241

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III. Intelligence Information for CVE-2026-42241

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Vendor Advisories for CVE-2026-42241 (1)

Vendor Pages for CVE-2026-42241 (1)

IV. Related Vulnerabilities

Same weakness: CWE-789

V. Comments for CVE-2026-42241

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