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How the CVE Works
The vulnerability in microlight.js (v0.0.7) occurs due to improper handling of CSS color values during syntax highlighting. The library uses a regular expression to parse color attributes but does not check if the match result is null before accessing its properties. When malicious or malformed input containing invalid color values is processed, a null pointer dereference occurs, triggering an uncaught TypeError. This can crash the application or disrupt its functionality, leading to denial of service (DoS).
DailyCVE Form
Platform: microlight.js
Version: 0.0.7
Vulnerability: Null pointer dereference
Severity: High
Date: Jun 17, 2025
Prediction: Patch expected by Jul 1, 2025
What Undercode Say
grep -r "color\s:\s[^;]" /path/to/microlight.js
// PoC triggering the vulnerability
document.querySelector('.code-block').style.color = "invalidcolor";
How Exploit
- Submit malformed CSS color values to elements processed by microlight.js.
- Trigger uncaught TypeError via null regex match access.
- Cause application crash or DoS.
Protection from this CVE
- Update to patched version (if released).
- Sanitize CSS input values.
- Add null checks for regex matches.
Impact
- Application crash.
- Denial of Service (DoS).
- Unstable rendering.
Sources:
Reported By: github.com
Extra Source Hub:
Undercode
