SB2025121221 - Source code exposure in Next.js App Router

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Main Vulnerability Database SB2025121221

SB2025121221 - Source code exposure in Next.js App Router

Published: December 12, 2025 Updated: January 4, 2026

Security Bulletin ID SB2025121221
Severity
Medium
Patch available
YES
Number of vulnerabilities 1
Exploitation vector Remote access
Highest impact Information disclosure

Breakdown by Severity

Medium 100%
  • Low
  • Medium
  • High
  • Critical

Description

This security bulletin contains information about 1 security vulnerability.


1) Information disclosure (CVE-ID: CVE-2025-55183)

The vulnerability allows a remote attacker to gain access to potentially sensitive information.

The vulnerability exists due to the server may expose the source code of any server function when receiving a specially crafted HTTP request. A remote attacker can gain access to sensitive information.

The vulnerability affects the following components:

- react-server-dom-webpack (Meta) 
- react-server-dom-turbopack (Meta) 
- react-server-dom-parcel (Meta) 

Successful exploitation requires the existence of a Server Function which explicitly or implicitly exposes a stringified argument.


Remediation

Install update from vendor's website.

References