GHSA-6xv4-9cqp-92rh: messageformat prototype pollution vulnerability

1. GitHub Advisory Database
2. GitHub Reviewed
3. CVE-2025-57353

messageformat prototype pollution vulnerability

High severity GitHub Reviewed Published Sep 24, 2025 to the GitHub Advisory Database • Updated Sep 24, 2025

Package

npm @messageformat/runtime (npm)

Affected versions

< 3.0.1

The Runtime components of messageformat package for Node.js prior to version 3.0.1 contain a prototype pollution vulnerability. Due to insufficient validation of nested message keys during the processing of message data, an attacker can manipulate the prototype chain of JavaScript objects by providing specially crafted input. This can result in the injection of arbitrary properties into the Object.prototype, potentially leading to denial of service conditions or unexpected application behavior. The vulnerability allows attackers to alter the prototype of base objects, impacting all subsequent object instances throughout the application’s lifecycle. This issue remains unaddressed in the latest available version.

References

• https://nvd.nist.gov/vuln/detail/CVE-2025-57353
• messageformat/messageformat#453
• https://github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57353

Published to the GitHub Advisory Database

Sep 24, 2025

Last updated

Sep 24, 2025