4.0.8-1

Ruby 4.0.8 portable binaries

Released by Ruby: 2026-10-22

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What's Changed

• Bug #22311: Build crashes on macOS 26 with the macOS 27 SDK because pipe2() and dup3() are unavailable - Ruby - Ruby Issue Tracking System
• Bug #22174: Set operations (&, ^, collect!, flatten, classify, divide) do not preserve compare_by_identity - Ruby - Ruby Issue Tracking System
• Bug #22383: Fix inverted STR_SHARED check in rb_str_tmp_frozen_release - Ruby - Ruby Issue Tracking System
• Bug #22387: str_shared_replace incorrectly recalculates termlen - Ruby - Ruby Issue Tracking System
• Bug #22327: RubyVM::ZJIT.reset_stats! aborts the process (Rust panic) when ZJIT is not enabled - Ruby - Ruby Issue Tracking System
• Bug #22381: MatchData assigned to $~ is incorrectly reused - Ruby - Ruby Issue Tracking System
• Bug #22321: Assertion Failed: rb_vm_search_method_slowpath:RB_TYPE_2_P(klass, RUBY_T_CLASS, RUBY_T_ICLASS): klass: T_MODULE - Ruby - Ruby Issue Tracking System
• Bug #22315: heap-use-after-free in String unpack with a block that mutates the receiver - Ruby - Ruby Issue Tracking System
• Bug #22318: heap uaf triggered in array.flatten - Ruby - Ruby Issue Tracking System
• Bug #22319: heap buffer overflow triggered by array's zip function - Ruby - Ruby Issue Tracking System
• Bug #22322: AddressSanitizer: use-after-poison in econv_description /ruby-src/build/../transcode.c - Ruby - Ruby Issue Tracking System
• Bug #22334: Assertion Failed: VM_ENV_FLAGS:FIXNUM_P(flags) - Ruby - Ruby Issue Tracking System
• Bug #22336: IO:Buffer Heap uaf - Ruby - Ruby Issue Tracking System
• Bug #22330: heap uaf from string.encode() - Ruby - Ruby Issue Tracking System
• Bug #22340: Win32: File.stat succeeds on symbolic-link loops on Windows - Ruby - Ruby Issue Tracking System
• Bug #22335: Stack corruption with >31 keyword args and refined Integer#== - Ruby - Ruby Issue Tracking System
• Bug #22339: Ruby::Box: crash / hang at VM shutdown with RUBY_FREE_AT_EXIT=1 - Ruby - Ruby Issue Tracking System
• Bug #22342: IO#gets can ignore the limit argument in some edge cases - Ruby - Ruby Issue Tracking System
• Bug #22391: Fix propagation of errno in rb_io_maybe_wait. - Ruby - Ruby Issue Tracking System
• Bug #22384: Regexp compile error in the 2nd+ branch of a top-level alternation leaks the parse tree (regression from #13332, Ruby 4.0) - Ruby - Ruby Issue Tracking System
• Bug #22388: Use-after-free when an Enumerable retains its each block - Ruby - Ruby Issue Tracking System
• Bug #22284: Passing an object with to_int to curry as its arity causes problems with LLP64. - Ruby - Ruby Issue Tracking System
• Bug #22416: Respect timezone abbreviation encodings in Time#strftime - Ruby - Ruby Issue Tracking System
• Bug #22426: ZJIT: keyword arguments swapped when passed out of declared order to a method with a block (please backport d81a11d4e6 to 4.0) - Ruby - Ruby Issue Tracking System
• Bug #22406: Process.fork can leave the child unable to resolve hostnames: getaddrinfo helper threads take glibc's resolver lock after releasing the fork lock - Ruby - Ruby Issue Tracking System
• Bug #22445: On macOS, a child of Kernel#fork can abort with "[BUG] pthread_rwlock_destroy: Resource busy (EBUSY)" - Ruby - Ruby Issue Tracking System
• Bug #22415: Thread.handle_interrupt needs to preserve errinfo - Ruby - Ruby Issue Tracking System
• Bug #22434: "No live threads left. Deadlock?" when running system() or spawn in Ractors - Ruby - Ruby Issue Tracking System
• Backport the regexp compiler program size overflow fixes to ruby_4_0 by hsbt · Pull Request #19025

Note: This list is automatically generated by tool/gen-github-release.rb. Because of this, some commits may be missing.

Full Changelog

ruby/ruby@v4.0.7...v4.0.8

Build revision: 4.0.8-1