ADVISORIES

• CVE-2025-58767 (NVD)
• GHSA-c2f4-jgmc-q2r5
• Vendor Advisory

GEM

rexml

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