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2025-041: Critical Security Vulnerability in React Server Components

criticalpublic exploitCVE-2025-55182
On December 3, 2025, the React Team publicly disclosed a critical security vulnerability affecting React Server Components (RSC) and related packages. The vulnerability allows for unauthenticated remote code execution (RCE) via maliciously crafted HTTP requests. It is recommended to update all affected component packages and any frameworks that integrate them.

CSIRTS triage

vendor: Reactproduct: React Server ComponentsRemote code execution
What
A critical vulnerability allows unauthenticated remote code execution via malicious HTTP requests.
Who is affected
Users of React Server Components and related packages are affected.
Urgency
Remediation is critical due to active exploitation of the vulnerability.
Action
Update all affected component packages and frameworks.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CERT-EU Security Advisories (EU · eu · site)
Severity
critical
Published
2025-12-04
Exploitation
Not in CISA KEV at last sync

Original advisory: https://cert.europa.eu/publications/security-advisories/2025-041/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2025-55182coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

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