VULNERABILITY INTELLIGENCE

CVE-2025-57349

CVSS score7.5 HIGH
EPSS probability0.40%
CISA KEVNot currently listed
Published2025-09-24
Last modified2026-06-17
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Description

The messageformat package, an implementation of the Unicode MessageFormat 2 specification for JavaScript, is vulnerable to prototype pollution due to improper handling of message key paths in versions prior to 2.3.0. The flaw arises when processing nested message keys containing special characters (e.g., __proto__ ), which can lead to unintended modification of the JavaScript Object prototype. This vulnerability may allow a remote attacker to inject properties into the global object prototype via specially crafted message input, potentially causing denial of service or other undefined behaviors in applications using the affected component.

Weakness classification

  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-1321

Primary references