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<filesystem>: weakly_canonical fails with ERROR_ACCESS_DENIED inside Windows AppContainer

Status: Open.

#6286 In microsoft/STL;

· bsosnader opened on May 14, 2026

README.md: Update working draft revision to N5046

documentationRelated to documentation or commentsRelated to documentation or comments

good first issueGood for newcomersGood for newcomers

Status: Open.

#6283 In microsoft/STL;

· frederick-vs-ja opened on May 13, 2026

<chrono>/<format>: Using milliseconds::max() triggers icx' UBSan

chronoC++20 chronoC++20 chrono

formatC++20/23 formatC++20/23 format

LWG issue neededA wording defect that should be submitted to LWG as a new issueA wording defect that should be submitted to LWG as a new issue

Status: Open.

#6277 In microsoft/STL;

· bersbersbers opened on May 8, 2026

ASan STL string and vector annotations leave poisoning behind

ASanAddress SanitizerAddress Sanitizer

bugSomething isn't workingSomething isn't working

Status: Open.

Bug

#6276 In microsoft/STL;

· amyw-msft opened on May 7, 2026

<chrono>: Stack buffer overflow in chrono::parse() with modified widths

bugSomething isn't workingSomething isn't working

chronoC++20 chronoC++20 chrono

Status: Open.

#6269 In microsoft/STL;

· StephanTLavavej opened on May 4, 2026

Classes that use [[no_unique_address]] may have different layout depending on compiler used

bugSomething isn't workingSomething isn't working

compilerCompiler work involvedCompiler work involved

high priorityImportant!Important!

Status: Open.

#6253 In microsoft/STL;

· JMazurkiewicz opened on Apr 14, 2026

P3725R3 Filter View Extensions For Safer Use

cxx20C++20 featureC++20 feature

defect reportApplied retroactivelyApplied retroactively

rangesC++20/23 rangesC++20/23 ranges

Status: Open.

#6242 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

P3059R2 Making User-Defined Constructors Of View Iterators/Sentinels private

cxx20C++20 featureC++20 feature

defect reportApplied retroactivelyApplied retroactively

rangesC++20/23 rangesC++20/23 ranges

Status: Open.

#6241 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

P4037R1 Supporting signed char And unsigned char In <random>

cxx26C++26 featureC++26 feature

defect reportApplied retroactivelyApplied retroactively

Status: Open.

#6240 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

LWG-4293 span::subspan/first/last chooses wrong constructor when T is const-qualified bool

LWGLibrary Working Group issueLibrary Working Group issue

Status: Open.

#6239 In microsoft/STL;

· StephanTLavavej opened on Apr 8, 2026

P0896R4_views_elements: The test isn't compatible with TEST_EVERYTHING

rangesC++20/23 rangesC++20/23 ranges

testRelated to test codeRelated to test code

Status: Open.

#6237 In microsoft/STL;

· frederick-vs-ja opened on Apr 8, 2026

P3726R2 Adjustments To Union Lifetime Rules

compilerCompiler work involvedCompiler work involved

cxx26C++26 featureC++26 feature

Status: Open.

#6229 In microsoft/STL;

· StephanTLavavej opened on Apr 6, 2026