Issues

• Data Exchange, STEP - plus/minus tolerance limits written as untyped MEASURE_WITH_UNIT (off-by-one stripping "POSITIVE_")

  1. Data Exchange
  Open-Cascade-SAS/OCCT#1581 · Filter by author pzfreo opened on Oct 3, 2026 · Release 8.1
  

• Data Exchange, STEP - RUNOUT_ZONE_DEFINITION written without its orientation, and for every diametral tolerance zone

  1. Data Exchange
  Open-Cascade-SAS/OCCT#1580 · Filter by author pzfreo opened on Oct 3, 2026 · Release 8.1
  

• Data Exchange, STEP - Complex triangulated face: fan with a repeated index and unmatched normal count give an invalid triangulation

  1. Data Exchange
  Open-Cascade-SAS/OCCT#1579 · Filter by author pgibertini opened on Oct 2, 2026 · Release 8.1
  

• Unresolved STEP reference binds the entity at the record number equal to its identifier

  1. Data Exchange
  Open-Cascade-SAS/OCCT#1578 · Filter by author pgibertini opened on Oct 2, 2026 · Release 8.1
  

• GeomGridEval_Surface::EvaluateGrid returns wrong points just below an interior BSpline knot, makes BRepBndLib::AddOptimal/AddOBB ~10-35x slower

  1. Modeling
  Open-Cascade-SAS/OCCT#1577 · Filter by author alex-all3dp opened on Oct 1, 2026 · Release 8.1
  

• Crash on chamfer on complex shape

  0. New2. Bug7. FreeCAD
  Open-Cascade-SAS/OCCT#1576 · Filter by author pieterhijma opened on Sep 30, 2026

• UnifySameDomain breaks spherical faces with pole edges when the spheres have rotated frames

  0. New2. Bug7. FreeCAD
  Open-Cascade-SAS/OCCT#1573 · Filter by author ChrLackner opened on Sep 29, 2026

• Faulty shape with fillet on a rounded cube

  0. New2. Bug7. FreeCAD
  Open-Cascade-SAS/OCCT#1571 · Filter by author pieterhijma opened on Sep 29, 2026

• Faulty shape with fillet beyond a radius

  0. New2. Bug7. FreeCAD
  Open-Cascade-SAS/OCCT#1570 · Filter by author pieterhijma opened on Sep 29, 2026

• Faulty shape with fillet on simple shape

  0. New2. Bug7. FreeCAD
  Open-Cascade-SAS/OCCT#1569 · Filter by author pieterhijma opened on Sep 29, 2026

• Crash on fillet meeting opposite edge

  0. New2. Bug7. FreeCAD
  Open-Cascade-SAS/OCCT#1568 · Filter by author pieterhijma opened on Sep 29, 2026
  1

• BRepAlgoAPI_Fuse of a partial torus and a tangent sphere gives an invalid, empty or wrong-volume result

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1567 · Filter by author tritao opened on Sep 28, 2026

• BRepPrimAPI_MakeRevol gives an invalid or wrong-volume solid for a circular profile edge

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1566 · Filter by author tritao opened on Sep 28, 2026

• Variant analysis: 3 unfixed sibling safety gaps in OCCT

  Open-Cascade-SAS/OCCT#1565 · Filter by author x4evexnol opened on Sep 28, 2026
  2

• License header of 8 TKGeomBase files says 'commercial software', contradicting LGPL-2.1

  Open-Cascade-SAS/OCCT#1564 · Filter by author potatobeanradio opened on Sep 27, 2026
  

• HLRBRep_Algo returns no outline for B-spline surfaces with many more U than V knots — Contap_HContTool::SamplePoint swaps its grid indices

  Open-Cascade-SAS/OCCT#1561 · Filter by author polygoro opened on Sep 25, 2026
  

• BRepTools::Read hangs on BRep with a number longer than 31 characters

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1560 · Filter by author noclone opened on Sep 24, 2026 · Release 8.0.2
  1

  

• STEPCAFControl_Writer segfaults writing a CommonLabel dimension after any STEP read

  Open-Cascade-SAS/OCCT#1559 · Filter by author pzfreo opened on Sep 21, 2026
  

• BRepMesh generates degenerate triangles on a helical pipe with a periodic circular section

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1558 · Filter by author GigHubAccount opened on Sep 21, 2026

• IFSelect_WorkSession::GiveFileRoot/GiveFileComplete return a pointer into one process-shared buffer

  Open-Cascade-SAS/OCCT#1556 · Filter by author gsdali opened on Sep 21, 2026

• HLRBRep_Data: TableauRejection::Set reads one element past a row (bound tested after dereference)

  Open-Cascade-SAS/OCCT#1546 · Filter by author clairbee opened on Sep 20, 2026
  1

• Modeling Algorithms - Boolean Cut with a helical swept tool silently removes nothing when the tool exits through a planar face (IntPatch loses the boundary vertex after seam decomposition)

  Open-Cascade-SAS/OCCT#1543 · Filter by author polygoro opened on Sep 16, 2026

• Division by Machine Precision in Intf_Tool::LinBox

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1542 · Filter by author galbramc opened on Sep 16, 2026
  

• Applying ShapeUpgrade_UnifySameDomain to a valid boolean cut (box - sphere) produces an invalid shape

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1541 · Filter by author jdegenstein opened on Sep 15, 2026
  

• Violation of the the C++ One Definition Rule

  0. New2. Bug
  Open-Cascade-SAS/OCCT#1536 · Filter by author galbramc opened on Sep 13, 2026