CVE-2025-27597: Intlify Vue-i18n

High severity, CVSS 8.9. EPSS: 0.6% chance of exploitation in the next 30 days.

Vue I18n is the internationalization plugin for Vue.js. @intlify/message-resolver and @intlify/vue-i18n-core are vulnerable to Prototype Pollution through the entry function: handleFlatJson. An attacker can supply a payload with Object.prototype setter to introduce or modify properties within the global prototype chain, causing denial of service (DoS) a the minimum consequence. Moreover, the consequences of this vulnerability can escalate to other injection-based attacks, depending on how the library integrates within the application. For instance, if the polluted property propagates to sensitive Node.js APIs (e.g., exec, eval), it could enable an attacker to execute arbitrary commands within the application's context.

Affected products

• Intlify Vue-i18n: from 9.1.0, before 9.14.3 (fixed in 9.14.3); from 10.0.0-alpha.1, before 10.0.6 (fixed in 10.0.6); from 11.0.0-beta.0, before 11.1.2 (fixed in 11.1.2)

Published 2025-03-07. Last modified 2026-06-17.