The REXML gem before 3.3.2 has a DoS vulnerability when it parses an XML that has many entity expansions with SAX2 or pull parser API.
If you need to parse untrusted XMLs with SAX2 or pull parser API, you may be impacted to this vulnerability.
The REXML gem 3.3.3 or later include the patch to fix the vulnerability.
Don't parse untrusted XMLs with SAX2 or pull parser API.