SB2025120334 - Remote code execution via React Server Components in Next.js

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Main Vulnerability Database SB2025120334

SB2025120334 - Remote code execution via React Server Components in Next.js

Published: December 3, 2025 Updated: December 9, 2025

Security Bulletin ID SB2025120334
CSH Severity
Critical
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Code execution

Breakdown by Severity

Critical 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 vulnerability.


1) Deserialization of untrusted data (CVE-ID: CVE-2025-66478)

CWE-ID: CWE-502 - Deserialization of Untrusted Data

CVSSv4: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:A/U:Red


The vulnerability allows a remote attacker to execute arbitrary code on the target system.

The vulnerability exists due to insecure input validation when processing serialized data within the React's App Router. A remote non-authenticated attacker can send specially crafted HTTP request to the application and execute arbitrary code on the target system.

Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.

Note, vulnerability in the react server component is tracked as a separate vulnerability #VU119103 (CVE-2025-55182).


Remediation

Install update from vendor's website.

References