Vue I18n Allows Prototype Pollution in `handleFlatJson` - @intlify/vue-i18n-core

Description

Vulnerability type: Prototype Pollution

Vulnerability Location(s):

Description:

The latest version of @intlify/message-resolver (9.1) and @intlify/vue-i18n-core (9.2 or later), (previous versions might also affected), is vulnerable to Prototype Pollution through the entry function(s) handleFlatJson.

Recommendation

Update the @intlify/vue-i18n-core package to the latest compatible version. Followings are version details:

• Affected version(s): **>= 11.0.0-beta.0, < 11.1.2

  >= 10.0.0-alpha.1, < 10.0.6

  >= 9.2.0, < 9.14.3**

• Patched version(s): **11.1.2

  9.14.3**

References

• GHSA-p2ph-7g93-hw3m
• CVE-2025-27597
• CWE-1321
• CAPEC-310
• OWASP 2021-A6