2.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-45526

CVE-2025-45526: Withdrawn Advisory: microlight allows a denial of service

Withdrawn Advisory

This advisory has been withdrawn because the proof of concept does not demonstrate a practical security impact. This link is maintained to preserve external references.

Original Description

A denial of service (DoS) vulnerability has been identified in the JavaScript library microlight version 0.0.7. This library, used for syntax highlighting, does not limit the size of textual content it processes in HTML elements with the microlight class. When excessively large content (e.g., 100 million characters) is processed, the reset function in microlight.js consumes excessive memory and CPU resources, causing browser crashes or unresponsiveness. An attacker can exploit this vulnerability by tricking a user into visiting a malicious web page containing a microlight element with large content, resulting in a denial of service.

(GitHub Advisory)

Miggo Vulnerability Database

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CVE-2025-45526

CVE-2025-45526:

2.9

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
microlight	npm	<= 0.0.7

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability, as described in the original advisory, is a Denial of Service in the microlight JavaScript library, specifically within the reset function located in microlight.js. The advisory states that the library, version 0.0.7 and below, does not limit the size of textual content it processes. The reset function is designed to take the textContent of HTML elements with the microlight class and apply syntax highlighting. When this content is excessively large, the processing within the reset function (character-by-character iteration, tokenization, and DOM manipulation) consumes disproportionate CPU and memory resources, leading to a DoS condition in the browser. The provided file content for microlight.js confirms the existence and structure of this reset function. Although the advisory was withdrawn due to the PoC not demonstrating a practical security impact, the analysis is based on the original vulnerability claim which directly implicates the reset function's handling of large inputs.

Vulnerable functions

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WAF Protection Rules

WAF Rule

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Reasoning

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