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The CVE-2025-45476 vulnerability in REXML arises from its failure to properly handle XML documents containing multiple XML declarations. A maliciously crafted XML file can exploit this parsing flaw. When the REXML parser encounters more than one XML declaration (e.g., <?xml version="1.0"?>), it enters an inefficient processing state. This state causes excessive CPU consumption as the parser struggles to reconcile the invalid structure. The attack does not require significant computational resources from the attacker, as a small payload can trigger the resource exhaustion. This leads to a denial-of-service condition, making the application unresponsive.
Platform: Ruby
Version: 3.3.3-3.4.1
Vulnerability: DoS
Severity: Low
date: 2025-09-17
Prediction: Patch 2025-09-24
What Undercode Say:
`bundle update rexml`
`gem list rexml`
``
How Exploit:
Craft XML with multiple declarations.
Protection from this CVE
Update to rexml >=3.4.2.
Impact:
Application CPU exhaustion.
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Sources:
Reported By: github.com
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