Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Openjsf | Messageformat | < 2.3.0 |
Related Weaknesses (CWE)
References
- https://github.com/messageformat/messageformat/issues/452Issue TrackingThird Party Advisory
FAQ
What is CVE-2025-57349?
CVE-2025-57349 is a vulnerability with a CVSS score of 7.5 (HIGH). 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...
How severe is CVE-2025-57349?
CVE-2025-57349 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2025-57349?
Check the references section above for vendor advisories and patch information. Affected products include: Openjsf Messageformat.