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The REXML gem before 3.3.6 has a DoS vulnerability when it parses an XML that has many deep elements that have same local name attributes. If you need to parse untrusted XMLs with tree parser API like REXML::Document.new, you may be impacted to this vulnerability. If you use other parser APIs such as stream parser API and SAX2 parser API, this vulnerability is not affected.
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This report details CVE-2024-43398, a Denial of Service (DoS) vulnerability affecting the REXML library in Ruby. This vulnerability arises when parsing XML documents containing deeply nested elements with numerous identical local attribute names, leading to excessive resource consumption and slow processing, potentially causing application crashes. The vulnerability was discovered and reported on August 22, 2024, and impacts REXML versions older than 3.3.6
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