CVE-2024-49761: REXML ReDoS vulnerability
(updated )
The REXML gem before 3.3.9 has a ReDoS vulnerability when it parses an XML that has many digits between &# and x...; in a hex numeric character reference (&#x...;).
This does not happen with Ruby 3.2 or later. Ruby 3.1 is the only affected maintained Ruby. Note that Ruby 3.1 will reach EOL on 2025-03.
References
- github.com/advisories/GHSA-2rxp-v6pw-ch6m
- github.com/ruby/rexml
- github.com/ruby/rexml/commit/ce59f2eb1aeb371fe1643414f06618dbe031979f
- github.com/ruby/rexml/security/advisories/GHSA-2rxp-v6pw-ch6m
- github.com/rubysec/ruby-advisory-db/blob/master/gems/rexml/CVE-2024-49761.yml
- nvd.nist.gov/vuln/detail/CVE-2024-49761
- www.ruby-lang.org/en/news/2024/10/28/redos-rexml-cve-2024-49761
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