ruby: Memory allocation failure in Ruby regex engine (remotely exploitable DoS)

The regular expression engine regex.c in Ruby 1.8.5 and earlier, 1.8.6 through 1.8.6-p286, 1.8.7 through 1.8.7-p71, and 1.9 through r18423 allows remote attackers to cause a denial of service infinite loop and crash via multiple long requests to a Ruby socket, related to memory allocation failure...