ip-address: Address6 builds a parse diagnostic proportional to the input with no length bound, allowing a single long string to stall or crash the process

Summary new Address6 and Address6.isValid place no bound on the length of the string they parse. When the string contains a character that cannot appear in an IPv6 address, the parser builds a diagnostic that wraps every such character in a 34-byte , so the work and the memory scale with the inpu...