What’s Vulnerable › Vulnerabilities

CVE-2025-27597: Vue I18n Prototype Pollution in `handleFlatJson`

• Severity: high (CVSS 8.9 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.6% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-03-07 · updated 2026-06-17
• Weakness: CWE-1321

Description

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, < 9.14.3; from 10.0.0-alpha.1, < 10.0.6; from 11.0.0-beta.0, < 11.1.2

References

• https://github.com/intlify/vue-i18n/commit/4bb6eacda7fc2cde5687549afa0efb27ca40862a
• https://github.com/intlify/vue-i18n/security/advisories/GHSA-p2ph-7g93-hw3m
• https://github.com/intlify/vue-i18n/security/advisories/GHSA-p2ph-7g93-hw3m

Get alerted when CVE-2025-27597 or the next vulnerability affects your stack