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

Affected Packages

RubyGems rexml

Affected versions: 3.3.3 (fixed in 3.4.2)

Related CVEs

CVE-2025-58767

Key Information

GHSA ID

GHSA-c2f4-jgmc-q2r5

Published

September 17, 2025 6:26 PM

Last Modified

September 17, 2025 8:00 PM

CVSS Score

2.5 /10

Primary Ecosystem

RubyGems

Primary Package

rexml

GitHub Reviewed

✓ Yes

Dataset

Last updated: September 18, 2025 6:29 AM

Data from GitHub Advisory Database. This information is provided for research and educational purposes.