Issues

• WorkbookEvaluator doc tells callers to use ClearCache(), which does not exist (method is ClearAllCachedResultValues)

  nissl-lab/npoi#1933 · Filter by author hidingmyname opened on Oct 29, 2026
  

• PackagePart.AddRelationship documents InvalidFormatException for relationship-part targets, but throws InvalidOperationException

  nissl-lab/npoi#1931 · Filter by author hidingmyname opened on Oct 29, 2026
  

• PackageRelationshipTypes.CORE_PROPERTIES_ECMA376 uses "officedocument" instead of "officeDocument", so the save check never matches it

  nissl-lab/npoi#1920 · Filter by author hidingmyname opened on Oct 29, 2026
  

• skiasharp,dll locked by w3wp

  drawingneed-investigation
  nissl-lab/npoi#1917 · Filter by author atotechnology opened on Oct 20, 2026
  

• Add XSLF read-only chart parts and reusable chart frames

  nissl-lab/npoi#1912 · Filter by author shps951023 opened on Oct 18, 2026

• Add XSLF fixed-grid tables and cell text support

  nissl-lab/npoi#1910 · Filter by author shps951023 opened on Oct 18, 2026

• Add XSLF embedded PNG/JPEG pictures and picture shapes

  nissl-lab/npoi#1908 · Filter by author shps951023 opened on Oct 18, 2026

• Add XSLF text boxes, paragraphs, runs and basic formatting

  nissl-lab/npoi#1906 · Filter by author shps951023 opened on Oct 18, 2026

• Add XSLF shape container foundation

  nissl-lab/npoi#1904 · Filter by author shps951023 opened on Oct 18, 2026

• Add XSLF slide lifecycle and page size APIs

  nissl-lab/npoi#1902 · Filter by author shps951023 opened on Oct 18, 2026

• XLSX files break on & in charts or ]]> in headers and defined names, and charts lose their fills and lines

  nissl-lab/npoi#1895 · Filter by author yzhoholiev opened on Oct 17, 2026

• XSSF: xl/sharedStrings.xml is omitted from new workbooks with no shared strings, but its relationship and content-type override are still written (2.8.0 regression)

  bug
  nissl-lab/npoi#1894 · Filter by author vcaraulean opened on Oct 14, 2026

• AutoSizeColumn produces narrower columns since 2.8.0 (SkiaSharp migration): long text gets clipped

  bug
  nissl-lab/npoi#1893 · Filter by author MatiSanchez opened on Oct 13, 2026

• Cell Fill Custom ForegroundColor fail

  bugregressionxssf
  nissl-lab/npoi#1888 · Filter by author blavehuang opened on Oct 8, 2026
  2

  

• [BUG] XSSFWorkbook.ForceFormulaRecalculation returns false after being set to true (regression / PR #1827)

  bugformula
  nissl-lab/npoi#1879 · Filter by author santo998 opened on Sep 27, 2026 · NPOI 2.8.2

• NPOI 2.8.1 fails to load due to missing SkiaSharp 3.119.0 assembly

  bugcicd
  nissl-lab/npoi#1877 · Filter by author santo998 opened on Sep 26, 2026 · NPOI 2.8.2
  4

• Excel Function Implementation IV

  nissl-lab/npoi#1873 · Filter by author tonyqus opened on Sep 22, 2026

• Array formula fails: MATCH nested inside INDEX doesn't receive an array argument

  bug
  nissl-lab/npoi#1857 · Filter by author EmilienDup opened on Aug 24, 2026

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

  bughssfsecurity
  nissl-lab/npoi#1844 · Filter by author pawlos opened on Aug 16, 2026
  3

• Dependency on SkiaSharp 3.119.2 massively bloats package size.

  cicdneed-investigation
  nissl-lab/npoi#1836 · Filter by author msalinas-a opened on Aug 3, 2026
  7

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

  cicdformula
  nissl-lab/npoi#1830 · Filter by author ken-swyfft opened on Jul 30, 2026
  2

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

  bughssf
  nissl-lab/npoi#1818 · Filter by author HHobeck opened on Jun 5, 2026

• XWPF Chart Implementation (Word Chart support)

  nissl-lab/npoi#1732 · Filter by author tonyqus opened on Mar 13, 2026 · NPOI 2.9.0
  

• AltChunk containing docx file corrupts document

  enhancementxwpf
  nissl-lab/npoi#1670 · Filter by author kemsky opened on Jan 16, 2026 · NPOI 2.8.2
  2

• Stacked Column Chart not currently supported?

  question
  nissl-lab/npoi#1648 · Filter by author muguemjee opened on Oct 15, 2025