LOW

GHSA-c2f4-jgmc-q2r5

REXML has DoS condition when parsing malformed XML file

Quick fix

GHSA-c2f4-jgmc-q2r5 — rexml: upgrade to the fixed version with the command below.

bundle update rexml

Details

### 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

Are you affected?

Enter the version of the package you're using.

Affected packages

RubyGems/rexml

Introduced in: 3.3.3Fixed in: 3.4.2

Fixbundle update rexml

References

https://github.com/ruby/rexml/security/advisories/GHSA-c2f4-jgmc-q2r5[WEB]
https://nvd.nist.gov/vuln/detail/CVE-2025-58767[ADVISORY]
https://github.com/ruby/rexml/commit/5859bdeac792687eaf93d8e8f0b7e3c1e2ed5c23[WEB]
https://github.com/ruby/rexml[PACKAGE]
https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rexml/CVE-2025-58767.yml[WEB]
https://www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767[WEB]