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MEDIUM severity

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

MEDIUMFix: micromatch/micromatch#247

GHSA-952p-6rrq-rcjv is a medium-severity (CVSS 5.3) CWE-1333 vulnerability in micromatch. A fix is available for micromatch — see the affected versions and patch details below.

Also known asCVE-2024-4067
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Oct 23, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

  • CISA assesses this as automatable — exploitation doesn’t require manual, per-target effort, which raises the odds of mass scanning and opportunistic attacks.
  • CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for GHSA-952p-6rrq-rcjv.

EPSS Exploitation Probability

via FIRST.org ↗
1.4%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs73th percentile — riskier than 73% of all scored CVEsHighest risk
0.00%0.64%1.29%1.93%0.1%1.4%Apr 26Aug 26Oct 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

GHSA-952p-6rrq-rcjv by exploitation likelihood (EPSS) against impact (CVSS). Outside the shaded patch-first corner.

Where this sits among everything scored

Of 394,803 CVEs with a current EPSS score, this one falls in the < 10% band (highlighted). Counts from FIRST.org, log-scaled.

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

6Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
micromatchnpm
102.4Mdownloads / week

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.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmmicromatchall versions4.0.8npm install micromatch@4.0.8

Affected Products

1 product · 1 configurations
Application
micromatchjonschlinkert
< 4.0.8
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for micromatch, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update micromatch to 4.0.8 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-952p-6rrq-rcjv is resolved across your whole dependency graph.

  3. Workarounds

    Cap what an attacker can consume: apply request size, rate and timeout limits in front of the affected component, and run it with memory and CPU limits so exhaustion degrades one worker rather than the whole service.

Fixing This On Your OS

If you run this on a Linux distribution, patch through your package manager against the distro's own security advisory below — it tracks the exact backported fix for your release, which can ship on a different timeline (and sometimes a different severity) than the upstream project.

Red HatModerate
Workaround published by Red Hat
Mitigation for this issue is either not available or the currently available options don't meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Source: Red Hat security advisory for GHSA-952p-6rrq-rcjv (CC BY 4.0)
ProductFixed inAdvisory
Red Hat Advanced Cluster Security 4.6advanced-cluster-security/rhacs-main-rhel8:4.6.0-6RHSA-2024:10775
Red Hat Developer Hub 1.3 on RHEL 9rhdh/rhdh-hub-rhel9:1.3-100RHBA-2024:7523
Red Hat OpenShift Service Mesh 2.6 for RHEL 8openshift-service-mesh/grafana-rhel8:2.6.1-6RHSA-2024:6211
Red Hat Satellite 6.16 for RHEL 8foreman-0:3.12.0.1-1.el8satRHSA-2024:8906
Red Hat OpenShift Dev Spaces (RHOSDS) 3.25devspaces/code-rhel9:3.25.0-1765247843RHSA-2025:23225

Frequently Asked Questions

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/mic
O3 Security · Impact-Aware SCA

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