Prototype Pollution Vulnerability in Node.js Messageformat Package

CVE-2025-57353

What is CVE-2025-57353?

The messageformat package for Node.js prior to version 3.0.1 is susceptible to a prototype pollution vulnerability due to inadequate validation of nested message keys. This flaw allows attackers to craft malicious input that can manipulate the prototype chain of JavaScript objects. By exploiting this vulnerability, an attacker can inject arbitrary properties into the Object.prototype, which may lead to unexpected application behavior or denial of service conditions throughout the application's lifecycle. This critical issue has yet to be addressed in the current version.

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