REXML has DoS condition when parsing malformed XML file
Published: September 17, 2025
SECURITY IDENTIFIERS
- CVE: CVE-2025-58767 (NVD)
- GHSA: GHSA-c2f4-jgmc-q2r5
- Vendor Advisory: https://github.com/ruby/rexml/security/advisories/GHSA-c2f4-jgmc-q2r5
GEM
UNAFFECTED VERSIONS
< 3.3.3
PATCHED VERSIONS
>= 3.4.2
DESCRIPTION
Impact
The REXML gems from 3.3.3 to 3.4.1 have a DoS vulnerability when parsing XML containing multiple XML declarations. If you need to parse untrusted XMLs, you may be impacted to these vulnerabilities.
Patches
REXML gems 3.4.2 or later include the patches to fix these vulnerabilities.
Workarounds
Don't parse untrusted XMLs.
References
- https://www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767
- An announcement on www.ruby-lang.org
RELATED
- https://nvd.nist.gov/vuln/detail/CVE-2025-58767
- https://www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767
- https://github.com/ruby/rexml/security/advisories/GHSA-c2f4-jgmc-q2r5
- https://github.com/ruby/rexml/commit/5859bdeac792687eaf93d8e8f0b7e3c1e2ed5c23
- https://github.com/advisories/GHSA-c2f4-jgmc-q2r5