ADVISORIES
GEM
SEVERITY
CVSS v3.x: 7.5 (High)
PATCHED VERSIONS
- >= 3.3.9
DESCRIPTION
Impact
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.
Patches
The REXML gem 3.3.9 or later include the patch to fix the vulnerability.
Workarounds
Use Ruby 3.2 or later instead of Ruby 3.1.
References
- https://www.ruby-lang.org/en/news/2024/10/28/redos-rexml-cve-2024-49761
- Announced on www.ruby-lang.org.
RELATED
- https://nvd.nist.gov/vuln/detail/CVE-2024-49761
- https://github.com/ruby/rexml/releases/tag/v3.3.9
- https://github.com/ruby/rexml/security/advisories/GHSA-2rxp-v6pw-ch6m
- https://github.com/ruby/rexml/commit/ce59f2eb1aeb371fe1643414f06618dbe031979f
- https://www.ruby-lang.org/en/news/2024/10/28/redos-rexml-cve-2024-49761
- https://hackerone.com/reports/2807139
- https://github.com/advisories/GHSA-2rxp-v6pw-ch6m