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CVE-2025-58767

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Date: September 17, 2025

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 XMLs, you may be impacted to these vulnerabilities. The REXML gem 3.4.2 or later include the patches to fix these vulnerabilities.

Severity Score

Related Resources (6)

https://github.com/ruby/rexml/commit/5859bdeac792687eaf93d8e8f0b7e3c1e2ed5c23
https://github.com/ruby/rexml
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://nvd.nist.gov/vuln/detail/CVE-2025-58767
https://www.mend.io/vulnerability-database/CVE-2025-58767

Severity Score

Weakness Type (CWE)

Uncontrolled Resource Consumption

CWE-400

Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')

CWE-776

Top Fix

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Upgrade Version

Upgrade to version rexml - 3.4.2

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CVSS v3.1

Base Score:
Attack Vector (AV): LOCAL
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): NONE
Integrity (I): NONE
Availability (A): LOW

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