Multiple stack-based buffer overflows in sgminer before 4.2.2, cgminer before 4.3.5, and BFGMiner before 3.3.0 allow remote pool servers to have unspecified impact via a long URL in a client.reconnect stratum message to the (1) extract_sockaddr or (2) parse_reconnect functions in util.c.
https://github.com/sgminer-dev/sgminer/commit/b65574bef233474e915fdf18614aa211e31cc6c2
https://github.com/luke-jr/bfgminer/commit/c80ad8548251eb0e15329fc240c89070640c9d79