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4 days[ruby/rubygems] Raise on unknown alias in YAMLSerializerHiroshi SHIBATA resolve_alias previously returned nil for an alias whose anchor was not registered, so a forward reference such as "version: *missing" quietly produced a Specification with a nil field. Psych raises AnchorNotDefined for the same input. Reject the alias instead and match Psych's exception hierarchy when available. https://github.com/ruby/rubygems/commit/4c2f2dd55c Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> 4 days[ruby/rubygems] Cap inline-array nesting in YAMLSerializer#coerceHiroshi SHIBATA MAX_NESTING_DEPTH only guarded parse_node, so deeply nested inline sequences such as "[[[...]]]" recursed through coerce until the Ruby stack overflowed with SystemStackError, which safe_load did not catch. Thread the depth through coerce and reuse the same limit. https://github.com/ruby/rubygems/commit/98c455fb01 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> 4 days[ruby/rubygems] Validate Gem::Dependency type symbol before interningHiroshi SHIBATA build_dependency previously called .to_sym on the raw YAML value and only then ran validate_symbol!, so a disallowed symbol was already interned by the time the check raised. Pass the name string through validate_symbol! first and intern only after it is permitted. https://github.com/ruby/rubygems/commit/1284b3e581 Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> 4 days[ruby/rubygems] Reject plain "tag" key when deciding Gem::Specification in ↵Hiroshi SHIBATA YAMLSerializer build() previously promoted any Hash carrying a "tag" string key equal to "!ruby/object:Gem::Specification" to a real Specification, bypassing validate_tag! and allowing untagged YAML to set arbitrary instance variables via yaml_initialize even when permitted_classes was empty. Trust only the :tag symbol sentinel placed by build_mapping after the permitted_classes check. https://github.com/ruby/rubygems/commit/cc9d2785cb Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com> 6 days[ruby/rubygems] Fix a bug that `Gem::YAMLSerializer.load` ignores quotationSutou Kouhei `"a: b"` must be processed as a string value (`a: b`) not a map value (`{"a" => "b"}`). https://github.com/ruby/rubygems/commit/3c3dfe3168 2026-03-17[ruby/rubygems] Refactor validate_tag! to enforce permitted_classes ↵Hiroshi SHIBATA consistently with Psych Align YAMLSerializer's `permitted_classes` validation with Psych's whitelist semantics: an empty `permitted_classes` list denies all tagged classes, matching `Psych::ClassLoader::Restricted` behavior. - Rename `@permitted_tags` to `@permitted_classes` and simplify initialization - Extract `raise_disallowed_class!` from `validate_tag!` for clarity - Move `check_anchor!` before `validate_tag!` in `build_mapping` - Add test for `Gem::Version::Requirement` tag used by old gems like `escape` https://github.com/ruby/rubygems/commit/3c5855e833 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> 2026-03-17[ruby/rubygems] Fix Bundler crashing when installing very old gems:Edouard CHIN - ### Problem There is a regression where bundler can longer install gems that were packaged a long time ago, like the [memoize gem](https://rubygems.org/gems/memoize). Bundler will crash with such error: ``` Installing memoize 1.3.1 --- ERROR REPORT TEMPLATE ------------------------------------------------------- NoMethodError: undefined method 'as_list' for nil /Users/edouard/src/opensource/rubygems/lib/rubygems/dependency.rb:146:in 'Gem::Dependency#requirements_list' ``` ### Context These very old gems were packaged at the time were a `Gem::Dependency` had no ivars `requirement`. This is what the dumped gemspec looks like: ``` dependencies: - !ruby/object:Gem::Dependency name: test-unit type: :development version_requirement: version_requirements: !ruby/object:Gem::Requirement requirements: - - ">=" - !ruby/object:Gem::Version version: 2.0.2 version: ``` As opposed to a gem that was packaged more recently: ``` - !ruby/object:Gem::Dependency name: minitest-global_expectations requirement: !ruby/object:Gem::Requirement requirements: - - ">=" - !ruby/object:Gem::Version version: '0' type: :development prerelease: false version_requirements: !ruby/object:Gem::Requirement requirements: - - ">=" - !ruby/object:Gem::Version version: '0' ``` The change we made in https://github.com/ruby/rubygems/commit/cbe57bbbd71e8ac7fed686ae7d13a2fd1bd2e5b2#diff-5ccc8aa468df013cc970580e88642417da12284da6529a4885b9abf447ae95edL529 broke old gem installation. ### Solution If `requirement` isn't set in the hash, look for `version_requirements` instead. https://github.com/ruby/rubygems/commit/cfd8b20692 2026-03-12[ruby/rubygems] Support YAML 1.1 !binary tag in YAMLSerializerlolwut Decode base64-encoded values tagged with !binary in mapping keys, mapping values (both inline and block scalar), and sequence items. This fixes gem install failures for gems packaged with older RubyGems that used !binary encoding in checksums.yaml.gz. Fixes https://github.com/ruby/rubygems/issues/9387 https://github.com/ruby/rubygems/commit/cfc31601e9 Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com> 2026-03-10[ruby/rubygems] bin/rubocop -AHiroshi SHIBATA https://github.com/ruby/rubygems/commit/ba8e4ed9ed 2026-03-10[ruby/rubygems] Limit YAML nesting and alias resolutionsHiroshi SHIBATA https://github.com/ruby/rubygems/commit/d4c5fc58e7 2026-03-10[ruby/rubygems] Restrict platform ivars when deserializing YAMLHiroshi SHIBATA https://github.com/ruby/rubygems/commit/b8f77e3860 2026-03-10[ruby/rubygems] Handle malformed/unknown YAML Platform fieldsHiroshi SHIBATA https://github.com/ruby/rubygems/commit/e5bcde365f 2026-03-10[ruby/rubygems] Stop normalizing requirements to ArrayHiroshi SHIBATA https://github.com/ruby/rubygems/commit/6b0aa2a2d3 2026-03-10[ruby/rubygems] Treat rdoc_options as Hash instead of ArrayHiroshi SHIBATA https://github.com/ruby/rubygems/commit/074e3f7f62 2026-03-10[ruby/rubygems] Construct Gem::Platform from cpu/os/version fieldsHiroshi SHIBATA https://github.com/ruby/rubygems/commit/cf566c3079 2026-03-10[ruby/rubygems] Do not sanitize dependency requirements from YAMLHiroshi SHIBATA https://github.com/ruby/rubygems/commit/cbe57bbbd7 2026-03-10[ruby/rubygems] Raise on unknown YAML object tagsHiroshi SHIBATA https://github.com/ruby/rubygems/commit/c29b3b2240 2026-03-10[ruby/rubygems] Support YAML 1.2 nulls and fix nil emissionHiroshi SHIBATA https://github.com/ruby/rubygems/commit/940358f2c2 2026-03-10[ruby/rubygems] Return nil for empty YAML and raise on nilHiroshi SHIBATA https://github.com/ruby/rubygems/commit/c091444047 2026-03-10[ruby/rubygems] Fix double-quoted YAML escape handling.Hiroshi SHIBATA This leads installation issue of Windows. https://github.com/ruby/rubygems/commit/244b38acd7 2026-03-09Parse ISO8601 datetimes without Time.parseHiroshi SHIBATA 2026-03-09[ruby/rubygems] Simplify Psych exception stubs and fallback raisesHiroshi SHIBATA https://github.com/ruby/rubygems/commit/61bfb3fff8 2026-03-09[ruby/rubygems] Add Psych stub classes to yaml serializerHiroshi SHIBATA https://github.com/ruby/rubygems/commit/f3a1b17fce 2026-03-09[ruby/rubygems] Guard against nil next line in YAML serializerHiroshi SHIBATA https://github.com/ruby/rubygems/commit/faab31b5cf 2026-03-09[ruby/rubygems] Optimize YAML serializer line handlingHiroshi SHIBATA https://github.com/ruby/rubygems/commit/ef022c664f 2026-03-09[ruby/rubygems] Simplify indentation handling in YAML serializerHiroshi SHIBATA https://github.com/ruby/rubygems/commit/50becac99a 2026-03-09[ruby/rubygems] Use Psych-specific YAML error classesHiroshi SHIBATA https://github.com/ruby/rubygems/commit/e07e88a232 2026-03-09[ruby/rubygems] Refactor YAMLSerializer into Parser/Builder/EmitterHiroshi SHIBATA https://github.com/ruby/rubygems/commit/bfe17c110c 2026-03-09[ruby/rubygems] Add Gem object reconstruction from parsed YAMLHiroshi SHIBATA Add convert_to_spec and convert_any methods that transform parsed YAML data structures (with :tag metadata) back into Gem::Specification, Version, Platform, Requirement, and Dependency objects. Wire these into the load method so it returns fully reconstructed Gem objects. convert_to_spec normalizes specification_version to Integer, rdoc_options to Array of Strings, and other array fields (files, test_files, executables, requirements, extra_rdoc_files) to proper arrays. convert_any handles Gem::Version::Requirement (legacy) and validates requirement operators and dependency type symbols against permitted lists. https://github.com/ruby/rubygems/commit/fe1a29ef2d 2026-03-09[ruby/rubygems] Add full YAML parser with recursive descentHiroshi SHIBATA Replace the simple regex-based load method with a full recursive descent parser (parse_any) that handles nested hashes, arrays, block scalars (| and |-), YAML anchors (&anchor) and aliases (*alias), !ruby/object: type tags, flow notation ({} and []), and non-specific tag stripping (! prefix). Add helper methods: parse_block_scalar for multiline strings, build_permitted_tags for security validation, unquote_simple for type coercion (booleans, integers, timestamps, quoted strings), and improve strip_comment to handle # inside quoted strings. The parser returns raw Ruby data structures (Hash, Array, String) with :tag metadata for typed objects, without yet reconstructing Gem-specific objects. https://github.com/ruby/rubygems/commit/053b576c20 2026-03-09[ruby/rubygems] Add YAML serializer (dump) for Gem objectsHiroshi SHIBATA Replace the simple dump_hash method with dump_obj that can serialize Gem::Specification, Version, Platform, Requirement, Dependency, Hash, Array, Time, and String objects into YAML format. This enables pure-Ruby YAML serialization without depending on Psych. The serializer handles multiline strings (block scalars), special character quoting ($, !, &, *, :, @, %), and proper indentation for nested structures. https://github.com/ruby/rubygems/commit/bffb238b35 2024-07-19[rubygems/rubygems] Fix line comment issue for mapalpha0x00 https://github.com/rubygems/rubygems/commit/7ca06e139b 2024-06-06[rubygems/rubygems] Move Bundler settings specific logic to BundlerDavid Rodríguez https://github.com/rubygems/rubygems/commit/7d1e8be2ce 2024-01-24[rubygems/rubygems] Keep compatibility of past versionsHiroshi SHIBATA https://github.com/rubygems/rubygems/commit/54b67fb251 2024-01-24[rubygems/rubygems] Skip to load commented out wordsHiroshi SHIBATA https://github.com/rubygems/rubygems/commit/e6a9148ba2 2023-12-05[rubygems/rubygems] Prefer String#split with block in Gem::YAMLSerializer#loadMau Magnaguagno String#split supports a block since Ruby 2.6, avoiding intermediate array. https://github.com/rubygems/rubygems/commit/69cdf9e9d4 2023-11-13[rubygems/rubygems] Let RuboCop target Ruby 3.0David Rodríguez https://github.com/rubygems/rubygems/commit/70243b1d72 2023-10-24[rubygems/rubygems] Handle empty arrayHiroshi SHIBATA https://github.com/rubygems/rubygems/commit/7c0afdd9af 2023-09-15[rubygems/rubygems] Stop allocating the same settings keys repeatedlySamuel Giddins Running `bundle update --bundler` on a rails app locally: ``` ==> memprof.after.txt <== Total allocated: 301.90 kB (3794 objects) Total retained: 73.24 kB (698 objects) ==> memprof.before.txt <== Total allocated: 14.47 MB (196378 objects) Total retained: 25.93 kB (202 objects) ``` So for a slight increase in retained memory (all keys are now retained), we go from about 200k allocations in the settings file to under 4k https://github.com/rubygems/rubygems/commit/e64debb6ae 2023-04-19[rubygems/rubygems] Copy YAMLSerializer from BundlerHiroshi SHIBATA https://github.com/rubygems/rubygems/commit/6a97346708


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