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Infinite loop on a malformed .xls whose declared stream size exceeds its block chain

bug

hssf

security

Status: Open.

#1844 In nissl-lab/npoi;

· pawlos opened on Aug 16, 2026

Dependency on SkiaSharp 3.119.2 massively bloats package size.

cicd

need-investigation

Status: Open.

#1836 In nissl-lab/npoi;

· msalinas-a opened on Aug 3, 2026

net472: strong-named NPOI.Core cannot load unsigned ExcelFinancialFunctions — all financial functions throw FileLoadException

cicd

formula

Status: Open.

#1830 In nissl-lab/npoi;

· ken-swyfft opened on Jul 30, 2026

CreateTOC NullReferenceException

bug

xwpf

Status: Open.

#1820 In nissl-lab/npoi;

· camus0109 opened on Jun 15, 2026

NPOI.POIFS.FileSystem.NotOLE2FileException: Invalid header signature; read 0x0000000000000000, expected 0xE11AB1A1E011CFD0

bug

hssf

Status: Open.

#1818 In nissl-lab/npoi;

· HHobeck opened on Jun 5, 2026

Introduction to Open Source Maintainence Fee license

Commercialcommercial featurecommercial feature

Status: Open.

#1785 In nissl-lab/npoi;

· tonyqus opened on Apr 3, 2026

·  

NPOI 2.8.1

Developer Friendly API Implementation

api

Status: Open.

#1775 In nissl-lab/npoi;

· tonyqus opened on Mar 31, 2026

·  

NPOI 2.8.1

XWPF Chart Implementation (Word Chart support)

Status: Open.

#1732 In nissl-lab/npoi;

· tonyqus opened on Mar 13, 2026

·  

NPOI 2.9.0

Excel Function Implementation III

Status: Open.

#1722 In nissl-lab/npoi;

· tonyqus opened on Mar 11, 2026

·  

NPOI 2.8.1

AltChunk containing docx file corrupts document

enhancement

xwpf

Status: Open.

#1670 In nissl-lab/npoi;

· kemsky opened on Jan 16, 2026

·  

NPOI 2.8.1

Stacked Column Chart not currently supported?

question

Status: Open.

#1648 In nissl-lab/npoi;

· muguemjee opened on Oct 15, 2025

sheet.ShiftRows throws System.InvalidOperationException:“Cannot add merged region B3:C3 to sheet because it overlaps with an existing merged region (B3:C3).”

bug

xssf

Status: Open.

#1646 In nissl-lab/npoi;

· TimLee88 opened on Oct 11, 2025