CVE-2025-11953: React Native Community CLI OS Command Injection Vulnerability

In short

React Native Community CLI has a weakness classified as OS command injection (CWE-78). CISA added it to its Known Exploited Vulnerabilities catalog on 2026-02-05. NVD lists CVSS 3.1 at 9.8 CRITICAL.

What it is

“React Native Community CLI contains an OS command injection vulnerability which could allow unauthenticated network attackers to send POST requests to the Metro Development Server and run arbitrary executables via a vulnerable endpoint exposed by the server. On Windows, attackers can also execute arbitrary shell commands with fully controlled arguments.” — CISA KEV, retrieved 2026-11-01

“The Metro Development Server, which is opened by the React Native Community 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.” — NVD, retrieved 2026-11-01

Who is affected

React Native Community CLI. NVD lists the following versions as affected:

• Versions from 19.0.0 inclusive, before 19.1.2
• Versions version 18.0.0
• Versions version 20.0.0

Exploitation status

CISA KEV added: 2026-02-05. Known ransomware campaign use: Not reported by CISA. Due date CISA set for US federal civilian agencies: 2026-02-26.

Scores

NVD CVSS 3.1: 9.8 CRITICAL; vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H; source [email protected].

EPSS by FIRST: 93.98%; percentile 99.85; score date 2026-10-31. EPSS estimates the probability of exploitation in the next 30 days.

CWE: CWE-78.

Timeline

CISA required action

“Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.” — CISA KEV

What to do

• Confirm whether you run React Native Community CLI and which version.
• Apply the vendor update or mitigation in the advisory.
• Follow CISA’s required action.
• Review the vendor guidance on signs of compromise.
• Track the fix through completion.

References

• Patch: https://github.com/react-native-community/cli/commit/15089907d1f1301b22c72d7f68846a2ef20df547
• Third Party Advisory: https://x.com/SzymonRybczak/status/1986199665000566848
• Third Party Advisory: https://x.com/thymikee/status/1986770875954475375
• NVD detail
• CVE.org record
• CISA KEV catalog

Sources and dates

CISA Known Exploited Vulnerabilities Catalog, version 2026.10.30; retrieved 2026-11-01. CISA KEV data: CC0 1.0. No endorsement by CISA.

NVD retrieved: 2026-11-01. This product uses the NVD API but is not endorsed or certified by the NVD.

EPSS scores by FIRST; score date 2026-10-31.