Two vunerabilities were discovered in c-ares, an asynchronous name resolver library: CVE-2023-31130 ares_inet_net_pton is found to be vulnerable to a buffer underflow for certain ipv6 addresses, in particular '0::00:00:00/2' was found to cause an issue. c-ares only uses this function internally for configuration purposes, however external usage for other purposes may cause more severe issues. CVE-2023-32067 Target resolver may erroneously interprets a malformed UDP packet with a lenght of 0 as a graceful shutdown of the connection, which could cause a denial of service.