Arbitrary Code Injection Affecting @modern-js/utils package, versions >=2.65.2 <2.69.3
Threat Intelligence
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Snyk has reported that there have been attempts or successful attacks targeting this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published29 Dec 2025
- disclosed3 Dec 2025
- creditLachlan Davidson
Introduced: 3 Dec 2025
NewCVE-2025-55182 (opens in a new tab)How to fix?
Upgrade @modern-js/utils to version 2.69.3 or higher.
Overview
@modern-js/utils is a progressive web framework based on React.
Affected versions of this package are vulnerable to Arbitrary Code Injection via unsafe deserialization of RSC payloads from HTTP requests to Server Function endpoints. An unauthenticated attacker can execute arbitrary code on the server by sending malicious HTTP requests.
Note:
Serverless applications and applications that do not use a framework, bundler, or bundler plugin that supports React Server Components are not affected by this vulnerability.
Modern.js ships with a bundled copy of react-server-dom-webpack@19.0.0; however, at the time of disclosure, the RSC features were in development and required an opt-in. The vulnerability is exploitable only if RSC services are explicitly enabled; without setting server.rsc: true, the RSC plugin is not loaded, and the application does not execute the vulnerable code.