REXML is an XML toolkit for Ruby. The REXML gem before 3.3.1 has some DoS vulnerabilities when it parses an XML that has many specific characters such as `<`, `0` and `%>`. If you need to parse untrusted XMLs, you many be impacted to these vulnerabilities. The REXML gem 3.3.2 or later include the patches to fix these vulnerabilities. Users are advised to upgrade. Users unable to upgrade should avoid parsing untrusted XML strings.
CVE ID: CVE-2024-39908
CVSS Base Severity: MEDIUM
CVSS Base Score: 4.3
Vendor: ruby
Product: rexml
EPSS Score: 0.04% (probability of being exploited)
EPSS Percentile: 11.66% (scored less or equal to compared to others)
EPSS Date: 2025-02-15 (when was this score calculated)