What’s Vulnerable › Vulnerabilities
CVE-2025-57349
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.4% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2025-09-24 · updated 2026-06-17
- Weakness: CWE-1321
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.
Affected products
- Openjsf Messageformat: before 2.3.0 — fixed in 2.3.0
How to fix
Upgrade to a fixed version: Openjsf Messageformat 2.3.0. Check the vendor advisory for mitigations.
References
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