Vulnerability in Amazon React Server Components (CVE-2025-66478)
Summary
Vulnerability in Amazon React Server Components (CVE-2025-66478). Risk of unauthorized operations or information disclosure.
Original description
The description as published by the source.
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
Source: AWS Security Bulletins NVD
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2025-66478 has been found in Amazon React Server Components.
Risk of unauthorized operations or information disclosure.
What to do: apply the vendor's official patched release.
If unsure, ask your IT team or search "Amazon React Server Components CVE-2025-66478" on the vendor's site.
CVE-2025-66478 (Amazon React Server Components)
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (unclassified) exists in Amazon React Server Components.
Check the vendor advisory for the affected versions of Amazon React Server Components.
Severity: ?. Risk of unauthorized operations or information disclosure.
Update to the patched release per vendor advisory.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Audit SBOM/dependencies to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
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1Identify exposure identify
Audit SBOM/dependencies for affected components.資産台帳・SBOM・依存マニフェストで Amazon React Server Components を使っているサービスとバージョンを洗い出す。
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2Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
References
- AWS aws.amazon.com