GitHub Advisoryadvisory · npm

GHSA-952p-6rrq-rcjv Regular Expression Denial of Service (ReDoS) in micromatch

MEDIUM Published 2024-05-14 Modified 2024-08-28 Official page ↗
Aliases
CVE-2024-4067
Ecosystem
npm
Packages
micromatch
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weaknesses
CWE-1333
Reviewed
2024-08-21

Affected packages

• npm micromatch: < 4.0.8 → fixed in 4.0.8

Description

The NPM package `micromatch` prior to version 4.0.8 is vulnerable to Regular Expression Denial of Service (ReDoS). The vulnerability occurs in `micromatch.braces()` in `index.js` because the pattern `.*` will greedily match anything. By passing a malicious payload, the pattern matching will keep backtracking to the input while it doesn't find the closing bracket. As the input size increases, the consumption time will also increase until it causes the application to hang or slow down. There was a merged fix but further testing shows the issue persisted prior to https://github.com/micromatch/micromatch/pull/266. This issue should be mitigated by using a safe pattern that won't start backtracking the regular expression due to greedy matching.

Related

Alias · CVE (1)

  • CVE-2024-4067 The NPM package `micromatch` prior to 4.0.8 is vulnerable to Regular Expression Denial of Service (ReDoS). vulnerability

Weakness · CWE (1)

  • CWE-1333 Inefficient Regular Expression Complexity weakness

References