The REXML gem before 3.2.5 in Ruby before 2.6.7, 2.7.x before 2.7.3, and 3.x before 3.0.1 does not properly address XML round-trip issues. An incorrect document can be produced after parsing and serializing.
{ "cpes": [ "cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*" ], "severity": "High" }