A flaw was found in Ruby's net-imap library. In certain versions, there is a possibility for denial of service by memory exhaustion in the net-imap response parser. At any time while the client is connected, a malicious server can send highly compressed uid-set data, which is automatically read by the client's receiver thread. The response parser converts the uid-set data into arrays of integers with no limitation on the expanded size of the ranges, which can trigger memory exhaustion.

A flaw was found in Ruby's CGI gem. Processing specially crafted large cookies with the CGI::Cookie.parse method can cause excessive resource consumption due to a missing limit on the length of the raw cookie value, resulting in a denial of service.

A flaw was found in the URI ruby gem package, where userinfo leakage can occur in the uri gem. The methods URI#join, URI#merge, and URI#+ retained userinfo, such as user:password, even after the host is replaced. When generating a URL to a malicious host from a URL containing secret userinfo using these methods, and having someone access that URL, an unintended userinfo leak can occur.