REXML has DoS condition when parsing malformed XML file
### 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
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describes (1)
Related CVEs.
| ID | severity | exploitable | ||
|---|---|---|---|---|
| CVE-2025-58767US | medium5.3 | — | ||
REXML is an XML toolkit for Ruby. The REXML gems from 3.3.3 to 3.4.1 has a DoS vulnerability when parsing XML containing multiple XML declarations. If you need to parse untrusted X… | ||||
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references
External citations — patches, advisories, analysis.
- https://github.com/ruby/rexmlPACKAGE
- https://github.com/ruby/rexml/commit/5859bdeac792687eaf93d8e8f0b7e3c1e2ed5c23WEB
- https://github.com/ruby/rexml/security/advisories/GHSA-c2f4-jgmc-q2r5WEB
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/rexml/CVE-2025-58767.ymlWEB
- https://nvd.nist.gov/vuln/detail/CVE-2025-58767ADVISORY
- https://www.ruby-lang.org/en/news/2025/09/18/dos-rexml-cve-2025-58767WEB
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