Historical catalog analysis: CISA added this entry on February 05, 2026. The entry reflects catalog information retrieved on August 31, 2026, not a snapshot archived on the inclusion date. Check current vendor guidance before acting.
What the vulnerability is
CVE-2025-11953 is an OS command injection vulnerability (CWE-78) located within the React Native Community CLI. The flaw exists in a vulnerable endpoint exposed by the Metro Development Server. An unauthenticated network attacker can send specially crafted POST requests to this server to execute arbitrary executables. In environments running Windows, the impact extends to the execution of arbitrary shell commands with fully controlled arguments.
Exposure and applicability
This vulnerability affects systems running the React Native Community CLI where the Metro Development Server is active and reachable over the network. Because the attack vector is unauthenticated, any network path allowing POST requests to the server’s endpoint constitutes an exposure path.
Infrastructure owners should identify development environments, CI/CD runners, or staging servers that utilize this CLI. The risk is highest where these development servers are exposed to broader internal networks or the public internet without restrictive access controls.
Remediation priorities
Based on the inclusion of this vulnerability in CISA’s Known Exploited Vulnerabilities (KEV) catalog as of February 5, 2026, remediation should be prioritized for all exposed instances. Our analysis suggests the following priority sequence:
- Immediate Patching: Apply vendor-supplied mitigations and updates to the React Native Community CLI to resolve the underlying command injection flaw.
- Network Isolation: For systems where immediate patching is not feasible, restrict network access to the Metro Development Server. Ensuring the server only listens on localhost or is protected by a strict firewall could reduce the likelihood of unauthenticated remote access.
- Decommissioning: If mitigations cannot be applied and the tool is not critical for current operations, discontinue use of the affected product version.
How to validate remediation
Verification must move beyond simple version checks, as a deployed fix does not inherently guarantee that the vulnerability is no longer exploitable in a specific environment.
Defenders should verify remediation by confirming that the vulnerable endpoint no longer accepts or processes the malicious POST requests described in the vendor’s technical commits and pull requests. Validation evidence should include logs showing the rejection of unauthorized requests to the Metro Development Server or successful deployment of the patched CLI version combined with a network scan confirming the server is not exposed to untrusted network segments.
Limits and open questions
While the vulnerability allows for arbitrary execution, it remains unknown if this flaw has been utilized in known ransomware campaigns. Additionally, because this involves an open-source component, there may be third-party libraries or proprietary implementations that incorporate the affected CLI code; these downstream dependencies may require separate updates.
Residual risk remains if the Metro Development Server is deployed in a configuration that bypasses standard network security controls, as patching the software does not address broader architectural exposures.
Source and editorial note
CVE-2025-11953: React Native Community CLI OS Command Injection Vulnerability · Source date: February 05, 2026 · Retrieved August 31, 2026.
Material facts are tied to the cited primary source. Recommendations are independent defensive analysis unless attributed to the source. Confirm consequential decisions against current authoritative guidance.
Archive date: February 08, 2026. The displayed post date is assigned three days after the source date to organize this retrospective archive; it does not mean this site published the analysis then. First published by this site: September 21, 2026 at 00:55 UTC.
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