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messageformat

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1 actionable advisory, newest first. Withdrawn advisories and news are excluded. Coverage is partial.

  1. Low, CVSS 1.7npmAmendedPublished

    messageformat has a prototype pollution vulnerability

    CVE-2025-57349 · GHSA-xfqm-j7pc-xrfc

    Affected
    • npm messageformat < 3.0.0-beta.0
    Fixed in
    3.0.0-beta.0· Vendor fix available
    Issue
    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.

    Recommended action: Upgrade to 3.0.0-beta.0 (pre-release) or later, then redeploy and verify.A vendor fix does not resolve your finding until you verify it in your own systems.

    Sources:osv.devSource checked Evidence →