Issues

• RooExponential: Issue with codegen gradient near zero slope

  bugin:RooFit
  root-project/root#23724 · Filter by author runtingt opened on Oct 15, 2026
  1

  

• [hist] Merging 3D histograms with alphanumeric labels on the axes is broken

  bugin:Hist
  root-project/root#23716 · Filter by author dpiparo opened on Oct 14, 2026 · 6.42.00
  

• Potential problems on Windows due to conflicting CRT libraries

  improvementin:Core Libraries
  root-project/root#23713 · Filter by author jblomer opened on Oct 14, 2026
  1

  

• rootcling crashes (SIGSEGV) on Xcode 27 when SDKROOT is set to an empty string

  bugin:Cling
  root-project/root#23712 · Filter by author cxwx opened on Oct 14, 2026
  

• Buffers of 2^24 bytes or slightly more are written uncompressed (RNTuple pages and TTree baskets)

  improvementin:I/O
  root-project/root#23706 · Filter by author rshrj opened on Oct 13, 2026
  1

  

• [cling] Missing find_dependency zstd::libzstd_shared in exported targets

  bugin:Cling
  root-project/root#23696 · Filter by author ferdymercury opened on Oct 12, 2026
  2

• I/O rule with several same-named sources is not executed for a class read from split sub-branches

  bugexperimentin:I/O
  root-project/root#23686 · Filter by author davidwalter2 opened on Oct 12, 2026 · 6.42.00
  

• [ntuple] Union merging can corrupt a late class field when its dictionary differs from the file

  bugin:RNTuple
  root-project/root#23683 · Filter by author Elvand-Lie opened on Oct 11, 2026
  

• Quadratic performance in TH1Merger::LabelMerge

  improvementin:Hist
  root-project/root#23681 · Filter by author lmoureaux opened on Oct 10, 2026
  2

  

• [Python] Sporadic failure of pyroot-pyz-ttree-branch in CI (vector proxy reference leak in vendored cppjit)

  bugin:Python Interface
  root-project/root#23677 · Filter by author guitargeek opened on Oct 9, 2026
  

• distrdf backends test 2-3x slower since the cppyy migration, timing out on Ubuntu 26.10

  improvementin:Python Interface
  root-project/root#23675 · Filter by author shuv-amp opened on Oct 9, 2026
  2

  

• [reve] Examine stack usage on new client connections

  bugin:Geometry
  root-project/root#23673 · Filter by author alja opened on Oct 9, 2026
  

• hadd -n omits object from last file for objects in nested TDirectories

  bugin:I/O
  root-project/root#23666 · Filter by author enirolf opened on Oct 9, 2026
  1

  

• [Windows] <filesystem> doesn't work in interpreted code

  bugin:Cling
  root-project/root#23664 · Filter by author guitargeek opened on Oct 9, 2026
  4

  

• [tmva][sofie] Inputs of unsupported type (e.g. float16) give code that does not compile instead of an error

  AI-Assistedbugin:SOFIE
  root-project/root#23655 · Filter by author Maher-star-eng opened on Oct 8, 2026
  

• rootcling emits #include "execution_defs.h" for a selected header that includes <algorithm>, and the generated dictionary then fails to compile

  bugin:Dictionaries
  root-project/root#23640 · Filter by author olantwin opened on Oct 7, 2026
  

• Custom pythonizations via __cppyy_pythonize__ are no longer respected with cppjit

  improvementin:Python Interface
  root-project/root#23630 · Filter by author tmadlener opened on Oct 6, 2026
  

• regression in h2root

  affects:masteraffects:6.40bugin:Other
  root-project/root#23628 · Filter by author ferdymercury opened on Oct 6, 2026
  

• Multi-threaded RDataFrame::Snapshot writes unreadable baskets (heap-use-after-free in TBasket::CopyTo)

  bugin:RDataFramein:TTree
  root-project/root#23550 · Filter by author theoreticMK opened on Sep 30, 2026
  1

  

• ROOT_PLUGIN_PATH is handled incorrectly

  bugexperimentin:I/O
  root-project/root#23536 · Filter by author aalkin opened on Sep 29, 2026
  

• [RF] NLL correction factor is constant and evaluated at NLL creation in RooFit

  bugin:RooFit
  root-project/root#23454 · Filter by author ikrommyd opened on Sep 22, 2026
  2

  

• TMath::IsInside() returns wrong results when Int_t is used

  bugin:Math Libraries
  root-project/root#23450 · Filter by author linev opened on Sep 22, 2026
  4

  

• [cling] Unable to find instantiation of declaration with two RFile-related lines of code (the first being invalid)

  bugin:Cling
  root-project/root#23439 · Filter by author silverweed opened on Sep 21, 2026
  1

  

• Extend the information provided by TCling::GetAutoParseClasses

  in:Core Librariesnew feature
  Feature

  root-project/root#23377 · Filter by author pcanal opened on Sep 15, 2026
  

• Add a way to explicitly request the registering a (non-typedef) type alias without requesting the dictionary.

  experimentin:Dictionariesnew feature
  Feature

  root-project/root#23375 · Filter by author pcanal opened on Sep 15, 2026
  1