Cloudflare blames today's outage on emergency React2Shell patch

BleepingComputer

December 5, 2025 at 1:53 PM

Actively Exploited

Summary

Cloudflare has reported an outage due to the emergency patching of a critical React remote code execution vulnerability that is currently being exploited in attacks. This incident highlights the urgency and severity of addressing such vulnerabilities to maintain security and service continuity.

Original Article Summary

Cloudflare has blamed today's outage on the emergency patching of a critical React remote code execution vulnerability, which is now actively exploited in attacks. [...]

Impact

React framework versions vulnerable to remote code execution, impacting applications built using React.

In the Wild

Yes

Timeline

Newly disclosed

Remediation

Apply the emergency patch provided by the React development team to mitigate the vulnerability. Ensure all applications using React are updated to the latest secure version as soon as possible.

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