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CVE-2025-66478: RCE in React Server Components

unknownknown exploitedpublic exploitCVE-2025-66478CVE-2025-55182
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
Bulletin ID: AWS-2025-030 Scope: AWS Content Type: Important (requires attention) Publication Date: 2025/12/03 20:00 PM PST Description: AWS is aware of the recently disclosed CVE-2025-55182 which affects the React Server Flight protocol in React versions 19.0, 19.1, and 19.2, as well as in Next.js versions 15.x, 16.x, Next.js 14.3.0-canary.77 and later canary releases when using App Router. This issue may permit unauthorized remote code execution on affected applications servers. AWS is aware of CVE-2025-66478, which has been rejected as a duplicate of CVE-2025-55182. Customers using managed AWS services are not affected, and no action is required. Customers running an affected version of React or Next.js in their own environments should update to the latest patched versions immediately: - Customers using React 19.x, with Server Functions and RSC Components should update to the latest patched versions 19.0.1, 19.1.2, and 19.2.1 - Customers using Next.js 15-16 with App Router should update to a patched version

CSIRTS triage

vendor: AWSproduct: ReactRemote code executionaffected: 19.0, 19.1, 19.2; Next.js 15.x, 16.x, 14.3.0-canary.77 and later
What
An issue may permit unauthorized remote code execution on affected application servers.
Who is affected
Customers running affected versions of React or Next.js in their own environments.
Urgency
Remediation is urgent due to the potential for exploitation.
Action
Update to the latest patched versions immediately.

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

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Details

Source
AWS Security Bulletins (INTL · vendor-psirt · site)
Severity
unknown
Published
2026-06-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://aws.amazon.com/security/security-bulletins/rss/aws-2025-030/

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-2025-66478coverage & exploitation statusNVD · CVE.org
CVE-2025-55182coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

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