messageformat prototype pollution vulnerability
The Runtime components of messageformat package for Node.js 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. Version 3.0.2 contains a fix.
Affected software
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| Platform | Package | Vulnerable versions | Fixed in |
|---|---|---|---|
| npm package | @messageformat/runtime | >= 3.0.1, < 3.0.2 | 3.0.2 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2025-57353
- https://github.com/messageformat/messageformat/issues/453
- https://github.com/messageformat/messageformat/issues/453#issuecomment-3466959449
- https://github.com/messageformat/messageformat/pull/464
- https://github.com/messageformat/messageformat/commit/82cd10b40e3f922f990bbcf88a6d14b70c0a3ce0
- https://github.com/VulnSageAgent/PoCs/tree/main/JavaScript/prototype-pollution/CVE-2025-57353
- https://github.com/messageformat/messageformat
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N- Weakness (CWE)
CWE-1321- Platform
- npm
- Package
@messageformat/runtime- Disclosed
- 24.09.2025
- Updated
- 11.10.2026 10:22
Sources and licenses
OSV / GitHub Advisory Database - GHSA-6xv4-9cqp-92rh - CC BY 4.0
Vulnerability history: @messageformat/runtime
All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.
This is the only known vulnerability of this package.
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