{"id":86989,"date":"2026-04-25T10:07:21","date_gmt":"2026-04-25T10:07:21","guid":{"rendered":""},"modified":"-0001-11-30T00:00:00","modified_gmt":"-0001-11-30T00:00:00","slug":"cve-2025-58767-high-severity-dos-vulnerability-in-rexml-ruby-xml-toolkit","status":"publish","type":"post","link":"https:\/\/www.ameeba.com\/blog\/cve-2025-58767-high-severity-dos-vulnerability-in-rexml-ruby-xml-toolkit\/","title":{"rendered":"CVE-2025-58767: High Severity DoS Vulnerability in REXML Ruby XML Toolkit<\/strong>"},"content":{"rendered":"

Overview<\/strong><\/p>\n

This report discusses a significant vulnerability, CVE-2025-58767, found in the REXML Ruby XML toolkit. This vulnerability affects versions 3.3.3 to 3.4.1 of the REXML gems and is of particular concern for those parsing untrusted XMLs. The vulnerability could lead to potential system compromise or data leakage, highlighting the critical nature of this issue.<\/p>\n

Vulnerability Summary<\/strong><\/p>\n

CVE ID: CVE-2025-58767
\nSeverity: High (7.5 CVSS)
\nAttack Vector: Network
\nPrivileges Required: None
\nUser Interaction: None
\nImpact: System compromise and potential data leakage<\/p>\n

Affected Products<\/strong><\/p>\n

Product | Affected Versions<\/p>\n

REXML Ruby XML Toolkit | 3.3.3 to 3.4.1<\/p>\n

How the Exploit Works<\/strong><\/p>\n

The exploit takes advantage of a flaw in REXML’s parsing mechanism. Specifically, when the toolkit encounters XML containing multiple XML declarations, a denial of service (DoS) vulnerability is triggered. This vulnerability allows an attacker to overwhelm the system, potentially leading to system compromise and data leakage.<\/p>\n

Conceptual Example Code<\/strong><\/p>\n

An attacker could exploit the vulnerability by sending a specially crafted XML file with multiple XML declarations. The conceptual example of a malicious payload might look like this:<\/p>\n

\n\n\nMalicious Content<\/element>\n<\/root><\/code><\/pre>\n
By sending this XML to an application that uses affected versions of REXML for parsing, an attacker could trigger the DoS condition and potentially compromise the system.<\/p>\n
Mitigation Guidance<\/strong><\/p>\n
To mitigate this vulnerability, users are advised to apply the vendor supplied patch by upgrading to REXML gem version 3.4.2 or later, which includes fixes for these vulnerabilities. As a temporary mitigation, a Web Application Firewall (WAF) or Intrusion Detection System (IDS) could be used to block or identify malicious XML traffic.<\/p>\n","protected":false},"excerpt":{"rendered":"
Overview This report discusses a significant vulnerability, CVE-2025-58767, found in the REXML Ruby XML toolkit. This vulnerability affects versions 3.3.3 to 3.4.1 of the REXML gems and is of particular concern for those parsing untrusted XMLs. The vulnerability could lead to potential system compromise or data leakage, highlighting the critical nature of this issue. Vulnerability […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"footnotes":""},"categories":[],"tags":[],"vendor":[],"product":[],"attack_vector":[],"asset_type":[],"severity":[],"exploit_status":[],"class_list":["post-86989","post","type-post","status-publish","format-standard","hentry"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t