CVE-2025-25341
📋 TL;DR
A vulnerability in libxmljs 1.0.11 allows attackers to cause a segmentation fault and denial-of-service by parsing a specially crafted XML document that accesses the internal _ref property on entity nodes. This affects any application using the vulnerable libxmljs library to parse untrusted XML input. The impact is limited to DoS rather than code execution.
💻 Affected Systems
- libxmljs
📦 What is this software?
Libxmljs by Libxmljs Project
⚠️ Risk & Real-World Impact
Worst Case
Complete service disruption through repeated DoS attacks, potentially affecting availability of applications that rely on XML parsing.
Likely Case
Intermittent service crashes when processing malicious XML payloads, requiring application restarts.
If Mitigated
Limited impact with proper input validation and monitoring; crashes would be contained to individual processes.
🎯 Exploit Status
The GitHub issue contains proof-of-concept code. Exploitation requires sending malicious XML to a vulnerable endpoint.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: 1.0.12 or later
Vendor Advisory: https://github.com/libxmljs/libxmljs/issues/667
Restart Required: Yes
Instructions:
1. Update libxmljs to version 1.0.12 or later using npm: npm update libxmljs. 2. Restart all Node.js applications using libxmljs. 3. Verify the update with npm list libxmljs.
🔧 Temporary Workarounds
Input Validation
allImplement strict input validation to reject or sanitize XML input before parsing.
Process Isolation
allRun XML parsing in isolated worker processes to contain crashes.
🧯 If You Can't Patch
- Implement rate limiting on XML parsing endpoints to reduce DoS impact.
- Deploy monitoring and automatic restart mechanisms for crashed processes.
🔍 How to Verify
Check if Vulnerable:
Check package.json or run npm list libxmljs to see if version 1.0.11 is installed.Check Version:
npm list libxmljsVerify Fix Applied:
Confirm libxmljs version is 1.0.12 or later with npm list libxmljs.📡 Detection & Monitoring
Log Indicators:
- Segmentation fault errors in application logs
- Unexpected process termination during XML parsing
Network Indicators:
- High volume of XML requests to parsing endpoints
- Malformed XML payloads in network traffic
SIEM Query:
source="application.logs" AND ("segmentation fault" OR "SIGSEGV") AND "libxmljs"