Issues

• URLSessionDataTask suspend/resume redelivers response prefix on Linux without error

  swiftlang/swift-corelibs-foundation#5627 · Filter by author henrymodisett opened on Oct 25, 2026
  1

• Linux: FileHandle.readabilityHandler stops being called while unread data is still in the pipe

  swiftlang/swift-corelibs-foundation#5618 · Filter by author deva0x opened on Oct 19, 2026

• process creation can inherit unowned handles

  Windows
  swiftlang/swift-corelibs-foundation#5616 · Filter by author compnerd opened on Oct 16, 2026
  

• CFCopyUserName() races on getpwuid(), so UserDefaults can lose writes

  swiftlang/swift-corelibs-foundation#5581 · Filter by author sinoru opened on Sep 28, 2026

• Static libFoundation.a can drop bridging conformances

  swiftlang/swift-corelibs-foundation#5580 · Filter by author sinoru opened on Sep 28, 2026
  7

• XMLParser segfaults on an inline DTD with an ATTLIST default keyword (#REQUIRED / #IMPLIED), enumerated default, or NOTATION

  swiftlang/swift-corelibs-foundation#5573 · Filter by author shenghaoc opened on Sep 25, 2026
  3

• XMLParser traps on invalid UTF-8 in a tag or attribute name

  swiftlang/swift-corelibs-foundation#5534 · Filter by author lrmoorejr opened on Aug 28, 2026

• Invalid free in ISO8601DateFormatter's lazy CFDateFormatter creation on Linux (heap corruption → delayed random segfaults)

  swiftlang/swift-corelibs-foundation#5533 · Filter by author JonCox opened on Aug 27, 2026
  3

  

• URLSession upload on Windows stalls forever once the body no longer fits one socket-buffer fill (~64 KB)

  swiftlang/swift-corelibs-foundation#5532 · Filter by author onetamer opened on Aug 24, 2026
  

• Backport #5448 (URLSession redirect crash under HTTP/2) to release/6.2 and release/6.3

  swiftlang/swift-corelibs-foundation#5524 · Filter by author esnunes opened on Aug 5, 2026
  4

  

• Version Windows builds

  Windows
  Task

  swiftlang/swift-corelibs-foundation#5520 · Filter by author compnerd opened on Jul 21, 2026

• Core Foundation reference types are not Hashable on non-Darwin platforms

  bugFoundation
  swiftlang/swift-corelibs-foundation#5518 · Filter by author Kyle-Ye opened on Jul 19, 2026

• NSRegularExpression.rangeOfFirstMatch returns incorrect {0, 0} anchored match for non-zero search range on Linux

  swiftlang/swift-corelibs-foundation#5467 · Filter by author g-mark opened on Apr 29, 2026
  1

• URLSession.download crashes when using custom URLProtocols

  swiftlang/swift-corelibs-foundation#5465 · Filter by author wade-tregaskis opened on Apr 22, 2026
  

• Binary plists generated by plutil on Linux are regularly larger than plutil on macOS (26.4.1)

  swiftlang/swift-corelibs-foundation#5452 · Filter by author nglevin opened on Apr 10, 2026
  10

  

• DateFormatter causes SIGILL on x86_64 Linux release builds (Swift 6.1)

  swiftlang/swift-corelibs-foundation#5450 · Filter by author vinayh opened on Apr 3, 2026
  3

• Bundle.urls(forResourcesWithExtension:subdirectory:) returns [NSURL] on Linux instead of [URL]

  bugImprovement
  swiftlang/swift-corelibs-foundation#5446 · Filter by author maartene opened on Apr 1, 2026
  4

• .documentXInclude does nothing

  swiftlang/swift-corelibs-foundation#5430 · Filter by author bruxisma opened on Mar 10, 2026

• _CFPlugInHandleDynamicRegistration changed in 26.4

  swiftlang/swift-corelibs-foundation#5428 · Filter by author AZero13 opened on Mar 4, 2026

• localizedStandardContains should match more liberally

  Foundation
  Bug

  swiftlang/swift-corelibs-foundation#5429 · Filter by author dabrahams opened on Mar 1, 2026
  5

• FileHandle does not set O_CLOEXEC on new file descriptors

  bug
  Bug

  swiftlang/swift-corelibs-foundation#5409 · Filter by author grynspan opened on Feb 12, 2026
  

• AnyHashable does not work correctly on linux

  bug
  swiftlang/swift-corelibs-foundation#5408 · Filter by author flymedllva opened on Feb 8, 2026
  1

• deletingPathExtension available on Windows but not macOS

  Foundation
  Feature

  swiftlang/swift-corelibs-foundation#5404 · Filter by author pfusik opened on Jan 30, 2026
  6

• Upgrade libxml2 dependency

  swiftlang/swift-corelibs-foundation#5390 · Filter by author marcprux opened on Jan 15, 2026
  20

• Documentation should be available on swift package index

  Documentation
  Task

  swiftlang/swift-corelibs-foundation#5357 · Filter by author itingliu opened on Jan 6, 2026
  1