It seems that cfn_nag doesn't support Ruby 3.x - when trying to run cfn_nag_scan --input-path . with Ruby 3.2.0, I get the stack trace below, but it runs with Ruby 2.7.2. It looks like the Psych library updated the yaml loader to be more secure, and it now errors on trying to parse a date, as it's not one of the whitelisted classes.
Are there plans to update cfn_nag to support this?
$ ~/.gem/bin/cfn_nag_scan --input-path .
/snap/ruby/299/lib/ruby/3.2.0/psych/class_loader.rb:99:in `find': Tried to load unspecified class: Date (Psych::DisallowedClass)
from /snap/ruby/299/lib/ruby/3.2.0/psych/class_loader.rb:28:in `load'
from (eval):2:in `date'
from /snap/ruby/299/lib/ruby/3.2.0/psych/scalar_scanner.rb:66:in `tokenize'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:65:in `deserialize'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:130:in `visit_Psych_Nodes_Scalar'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/visitor.rb:30:in `visit'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/visitor.rb:6:in `accept'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:35:in `accept'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:347:in `block in revive_hash'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:345:in `each'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:345:in `each_slice'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:345:in `revive_hash'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:169:in `visit_Psych_Nodes_Mapping'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/visitor.rb:30:in `visit'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/visitor.rb:6:in `accept'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:35:in `accept'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:320:in `visit_Psych_Nodes_Document'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/visitor.rb:30:in `visit'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/visitor.rb:6:in `accept'
from /snap/ruby/299/lib/ruby/3.2.0/psych/visitors/to_ruby.rb:35:in `accept'
from /snap/ruby/299/lib/ruby/3.2.0/psych.rb:334:in `safe_load'
from /snap/ruby/299/lib/ruby/3.2.0/psych.rb:369:in `load'
from /home/maverick/.gem/gems/cfn-model-0.6.6/lib/cfn-model/validator/resource_type_validator.rb:8:in `validate'
from /home/maverick/.gem/gems/cfn-model-0.6.6/lib/cfn-model/validator/schema_generator.rb:17:in `generate'
from /home/maverick/.gem/gems/cfn-model-0.6.6/lib/cfn-model/validator/cloudformation_validator.rb:13:in `validate'
from /home/maverick/.gem/gems/cfn-model-0.6.6/lib/cfn-model/parser/cfn_parser.rb:220:in `pre_validate_model'
from /home/maverick/.gem/gems/cfn-model-0.6.6/lib/cfn-model/parser/cfn_parser.rb:62:in `parse_without_parameters'
from /home/maverick/.gem/gems/cfn-model-0.6.6/lib/cfn-model/parser/cfn_parser.rb:43:in `parse'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag.rb:87:in `audit'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag.rb:68:in `block in audit_aggregate_across_files'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag.rb:65:in `each'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag.rb:65:in `audit_aggregate_across_files'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag.rb:35:in `audit_aggregate_across_files_and_render_results'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag_executor.rb:50:in `execute_aggregate_scan'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/lib/cfn-nag/cfn_nag_executor.rb:30:in `scan'
from /home/maverick/.gem/gems/cfn-nag-0.8.10/bin/cfn_nag_scan:11:in `<top (required)>'
from /home/maverick/.gem/bin/cfn_nag_scan:23:in `load'
from /home/maverick/.gem/bin/cfn_nag_scan:23:in `<main>'
It seems that cfn_nag doesn't support Ruby 3.x - when trying to run
cfn_nag_scan --input-path .with Ruby 3.2.0, I get the stack trace below, but it runs with Ruby 2.7.2. It looks like the Psych library updated the yaml loader to be more secure, and it now errors on trying to parse a date, as it's not one of the whitelisted classes.Are there plans to update cfn_nag to support this?