How severe is GHSA-399j-vxmf-hjvr?

GHSA-399j-vxmf-hjvr has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by GHSA-399j-vxmf-hjvr?

GHSA-399j-vxmf-hjvr affects the following packages: @react-native-community/cli (npm), @react-native-community/cli (npm), @react-native-community/cli (npm), @react-native-community/cli-server-api (npm), @react-native-community/cli-server-api (npm), @react-native-community/cli-server-api (npm). Ecosystems affected: npm.

How do I fix GHSA-399j-vxmf-hjvr?

Update @react-native-community/cli to version 20.0.0 or later. Run your dependency manager's update command and verify no transitive dependencies pin the vulnerable version. Use O3 Security's SCA scanner to confirm the fix is applied across your entire dependency tree.

Is GHSA-399j-vxmf-hjvr actively exploited in the wild?

No public exploit code has been indexed for GHSA-399j-vxmf-hjvr yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for GHSA-399j-vxmf-hjvr?

GHSA-399j-vxmf-hjvr has an EPSS (Exploit Prediction Scoring System) score of 14.0%, placing it in the 94th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score warrants monitoring and prompt remediation.

Is GHSA-399j-vxmf-hjvr in the CISA Known Exploited Vulnerabilities catalog?

Yes. GHSA-399j-vxmf-hjvr (React Native Community CLI OS Command Injection Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-02-05. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-02-26. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is GHSA-399j-vxmf-hjvr?

GHSA-399j-vxmf-hjvr is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

When was GHSA-399j-vxmf-hjvr published, and has it been updated?

GHSA-399j-vxmf-hjvr was published on November 3, 2025 and was last updated on February 5, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2026-02-05 — agencies required to remediate by 2026-02-26

📦 npm

GHSA-399j-vxmf-hjvr

CRITICAL

@react-native-community/cli has arbitrary OS command injection

Also known asCVE-2025-11953

Published

Nov 3, 2025

Updated

Feb 5, 2026

Affected

6 pkgs

Patched

6 / 6

Exploits

None indexed

EPSS Exploitation Probability

via FIRST.org ↗

14.0%probability of exploitation in next 30 days

Moderate Risk94th percentile-6.12%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

6 pkgs affected

📦@react-native-community/cli📦@react-native-community/cli📦@react-native-community/cli📦@react-native-community/cli-server-api📦@react-native-community/cli-server-api📦@react-native-community/cli-server-api

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects npm packages — download data is not available via public APIs for these ecosystems.

Description

The Metro Development Server, which is opened by the React Native CLI, binds to external interfaces by default. The server exposes an endpoint that is vulnerable to OS command injection. This allows unauthenticated network attackers to send a POST request to the server and run arbitrary executables. On Windows, the attackers can also execute arbitrary shell commands with fully controlled arguments.

Affected Packages

6 total 6 fixed

Ecosystem	Package	Vulnerable range	Fix
📦npm	`@react-native-community/cli`	≥ 20.0.0-alpha.0&&< 20.0.0	20.0.0
📦npm	`@react-native-community/cli`	≥ 19.0.0-alpha.0&&< 19.1.2	19.1.2
📦npm	`@react-native-community/cli`	≥ 18.0.0&&< 18.0.1	18.0.1
📦npm	`@react-native-community/cli-server-api`	≥ 20.0.0-alpha.0&&< 20.0.0	20.0.0
📦npm	`@react-native-community/cli-server-api`	≥ 19.0.0-alpha.0&&< 19.1.2	19.1.2
📦npm	`@react-native-community/cli-server-api`	≥ 18.0.0&&< 18.0.1	18.0.1

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is GHSA-399j-vxmf-hjvr in your stack?

O3 detects GHSA-399j-vxmf-hjvr across npm dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

9.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE Classification

CWE-78OS Command Injection

Weaponization

No known public exploit tooling found.

OpenSSF Scorecard

Package health score

cli

4.9/10

Code-Review8/10

Maintained8/10

Branch-ProtectionN/A

Assessed Jun 1, 2026

Timeline

Disclosed

Nov 3, 2025

KEV added

Feb 5, 2026

Last updated

Feb 5, 2026

Identifiers

GHSA-399j-vxmf-hjvr

References

Advisorynvd.nist.gov Webgithub.com Webgithub.com Webgithub.com Webgithub.com Webgithub.com Webgithub.com Webgithub.com Webgithub.com Webjfrog.com Webcisa.gov Webvulncheck.com Webx.com Webx.com Webx.com Packagegithub.com

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.