3.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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CVE-2025-5889

CVE-2025-5889: brace-expansion Regular Expression Denial of Service vulnerability

A vulnerability was found in juliangruber brace-expansion up to 1.1.11. It has been rated as problematic. Affected by this issue is the function expand of the file index.js. The manipulation leads to inefficient regular expression complexity. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. The name of the patch is a5b98a4f30d7813266b221435e1eaaf25a1b0ac5. It is recommended to apply a patch to fix this issue.

(GitHub Advisory)

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CVE-2025-5889

CVE-2025-5889:

3.1

CVSS Score

3.1

-

CVSS Score

Basic Information

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Technical Details

Package Name	Ecosystem	Vulnerable Versions	First Patched Version
brace-expansion	npm	>= 2.0.1, <= 4.0.0

Technical Details

Vulnerability Intelligence
Miggo AI

Root Cause Analysis

The vulnerability is a Regular Expression Denial of Service (ReDoS) in the brace-expansion npm package. The provided information explicitly states that the expand function in index.js is affected. I attempted to fetch structured commit information using get_commit_infos and get_commit_urls_from_pull_request, but these attempts failed. However, I was able to fetch the content of the commit page using fetch_url_content. This content included the diff for index.js, showing a change in a regular expression within the expand function. The original regex /,.*}/ was replaced by /,(?!,).*}/. This type of change is characteristic of a ReDoS fix, where an inefficient regex is replaced with a more performant one. The vulnerability description confirms that the issue is related to inefficient regular expression complexity. Therefore, the expand function is identified as the vulnerable function because it contained the problematic regex prior to the patch.

Vulnerable functions

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WAF Rule

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Reasoning

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