CVE-2025-67779
highpriority · track · 7EPSS 0.200 · 97 %ileDEEUNLUSEPSS · scored 2026-10-27
It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attack in a specific case. React Server Components versions 19.0.2, 19.1.3 and 19.2.2 are affected, allowing unsafe deserialization of payloads from HTTP requests to Server Function endpoints. This can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
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weaknesses
The CWE weakness classes this flaw belongs to.
affected products (60)
Products and version ranges known to be affected.
advisories (3)
Vendor and ecosystem advisories describing this.
- NCSC-2025-0394Kwetsbaarheden verholpen in React Server ComponentsNL2025-12-12csaf · ncsc_nlNL
Meta heeft kwetsbaarheden verholpen in React Server Components Parcel, Turbopack en Webpack.
- WID-SEC-W-2025-2835Vercel Next.js und React Server Components: Mehrere SchwachstellenDeutsch2025-12-11csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in Vercel Next.js und React Server Components ausnutzen, um Informationen offenzulegen und um einen Denial of Service Angriff durchzuführen.
- GHSA-7gmr-mq3h-m5h9Denial of Service Vulnerability in React Server Components2025-12-12ghsa · osvUS
## Impact It was found that the fix to address [CVE-2025-55184](https://github.com/facebook/react/security/advisories/GHSA-2m3v-v2m8-q956) in React Server Components was incomplete and does not prevent a denial of service attack in a specific case. We recommend updating immediately. The vulnerability exists in versions 19.0.2, 19.1.3, and 19.2.2 of: - [react-server-dom-webpack](https://www.npmjs.com/package/react-server-dom-webpack) - [react-server-dom-parcel](https://www.npmjs.com/package/react-server-dom-parcel) - [react-server-dom-turbopack](https://www.npmjs.com/package/react-server-dom-turbopack?activeTab=readme) These issues are present in the patches published on December 11th, 2025. ## Patches Fixes were back ported to versions 19.0.3, 19.1.4, and 19.2.3. If you are using any of the above packages please upgrade to any of the fixed versions immediately. If your app’s React code does not use a server, your app is not affected by this vulnerability. If your app does not use a framework, bundler, or bundler plugin that supports React Server Components, your app is not affected by this vulnerability. ## References See the [blog post](https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components) for more information and upgrade instructions.
also known as (3)
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sources
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references (8)
External citations — patches, advisories, analysis.
- https://react.dev/blog/2025/12/03/critical-security-vulnerability-in-react-server-components#update-instructionsPatchcnnvd
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-componentscnnvd
- https://vigilance.fr/vulnerability/React-denial-of-service-via-Server-Components-2-49089cnnvd
- https://www.facebook.com/security/advisories/cve-2025-67779cnnvd
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-componentsenisa_euvd
- https://www.facebook.com/security/advisories/cve-2025-67779enisa_euvd
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-componentsVendor Advisorynvd
- https://www.facebook.com/security/advisories/cve-2025-67779Vendor Advisorynvd
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