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yaml.load()inawscli/customizations/cloudformation/yamlhelper.pydoesn't pass a safe Loader. This can deserialize arbitrary Python objects and is an RCE risk if the YAML comes from user input or the network. Switched toyaml.safe_load().Changed files:
awscli/bcdoc/textwriter.py,awscli/customizations/cloudformation/yamlhelper.py,awscli/customizations/eks/ordered_yaml.py,awscli/customizations/emr/sshutils.py,awscli/testutils.pyand 1 moreExisting callers that pass the argument explicitly are unaffected - only the default value behavior changes.