Unknown · @Intlify/Message-Resolver · CVE-2025-27597
**Name of the Vulnerable Software and Affected Versions**
@intlify/message-resolver version 9.1
@intlify/vue-i18n-core versions 9.2 and later
**Description**
The vulnerability is a Prototype Pollution issue 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) as the minimum consequence. 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.
**Recommendations**
As a temporary workaround, consider disabling the `handleFlatJson` function until a patch is available.
Restrict access to the vulnerable module `@intlify/message-resolver` and `@intlify/vue-i18n-core` to minimize the risk of exploitation.
Avoid using the ` proto ` property in the affected API endpoint until the issue is resolved.
Update `@intlify/message-resolver` and `@intlify/vue-i18n-core` to a version that contains a fix for this vulnerability.