CVE intelligence and bounded remediation

CVE-2025-67779 — Facebook React security vulnerability

High CVSS 7.5

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.

Severity
High
CVSS
7.5 (3.1)
Published
2025-12-12
CISA KEV
Not currently listed
Ecosystem
software/application
Weaknesses
CWE-502, CWE-400

Affected products

  • facebook / react / 19.0.2
  • facebook / react / 19.1.3
  • facebook / react / 19.2.2
  • vercel / next.js
  • vercel / next.js / 15.6.0

Showing 5 representative product identities from 92 source matches. Confirm exact affected versions with the linked vendor and NVD evidence.

Matched remediation archetype

Unsafe deserialization and object reconstruction

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Check exposure

  • Inventory serialization formats accepted from requests, queues, caches, files, cookies, and cross-service messages.
  • Trace whether untrusted input can select classes, types, callbacks, constructors, or object hooks during decoding.
  • Identify signing, schema validation, trust-boundary, and compatibility settings for each decoder.

Remediate safely

  • Replace native object deserialization with a data-only format and explicit schema validation.
  • If replacement is not immediate, use a safe decoder with a minimal type allowlist and disable polymorphic or executable hooks.
  • Update the affected library and add inert tests for unknown types, extra fields, malformed nesting, and unsigned data.

Authoritative sources

Complete CVE record and remediation plan

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