GRScript18.dll before 1.2.2.0 in ActiveScriptRuby (ASR) before 1.8.7 does not properly restrict interaction with an Internet Explorer ActiveX environment, which allows remote attackers to execute arbitrary Ruby code via a crafted HTML document.

The HTTP/XMLRPC server in Ruby before 1.8.2 uses blocking sockets, which allows attackers to cause a denial of service (blocked connections) via a large amount of data.

Ruby 1.6.x up to 1.6.8, 1.8.x up to 1.8.2, and 1.9.0 development up to 2005-09-01 allows attackers to bypass safe level and taint flag protections and execute disallowed code when Ruby processes a program through standard input (stdin).

The CGI module in Ruby 1.6 before 1.6.8, and 1.8 before 1.8.2, allows remote attackers to cause a denial of service (infinite loop and CPU consumption) via a certain HTTP request.