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CVE-2025-55184

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 66.6% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2025-12-11 · updated 2026-10-07
• Weakness: CWE-502

Description

A pre-authentication denial of service vulnerability exists in React Server Components versions 19.0.0, 19.0.1 19.1.0, 19.1.1, 19.1.2, 19.2.0 and 19.2.1, including the following packages: react-server-dom-parcel, react-server-dom-turbopack, and react-server-dom-webpack. The vulnerable code unsafely deserializes payloads from HTTP requests to Server Function endpoints, which can cause an infinite loop that hangs the server process and may prevent future HTTP requests from being served.

Affected products

• React: from 19.0.0 before 19.0.2; from 19.1.0 before 19.1.3; from 19.2.0 before 19.2.2 — fixed in 19.0.2, 19.1.3, 19.2.2
• Next.js: from 13.3.0 before 14.2.35; from 15.0.0 before 15.0.7; from 15.1.0 before 15.1.11; from 15.2.0 before 15.2.8; from 15.3.0 before 15.3.8; from 15.4.0 before 15.4.10 — fixed in 14.2.35, 15.0.7, 15.1.11, 15.2.8, 15.3.8, 15.4.10

How to fix

Upgrade to a fixed version: React 19.0.2, 19.1.3, 19.2.2; Next.js 14.2.35, 15.0.7, 15.1.11, 15.2.8. Check the vendor advisory for mitigations.

References

• https://react.dev/blog/2025/12/11/denial-of-service-and-source-code-exposure-in-react-server-components
• https://www.facebook.com/security/advisories/cve-2025-55184
• https://github.com/KingHacker353/CVE-2025-55184

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