graphql-scalars PhoneNumber scalar is vulnerable to regular expression denial of service
The regular expression behind GraphQLPhoneNumber since 1.24.1 backtracks exponentially. A string made of a run of digits followed by one character that makes the match fail (for example "1".repeat(30) + "x") blocks the JavaScript thread for seconds, and every additional digit doubles the time. graphql-js calls parseLiteral while validating a document and parseValue while coercing variables, so the regex runs for every request that merely contains such a value in …