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CVE-2025-67779

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 20.0% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-12-12 · updated 2026-10-07
• Weakness: CWE-502

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.

Affected products

• React: 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: 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-2025-67779

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