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GHSA-r27j-894h-3w3p: mcp-data-vis vulnerable to denial of service via unsanitized `select` key lookup on `Object.prototype` with `precompile: true`

May 6, 2026

icu-minify’s runtime formatter resolves select branches by looking up the runtime value as a plain property on a prototype-bearing object. When the value coerces to a key that exists on Object.prototype (e.g. toString, __proto__, constructor, hasOwnProperty, valueOf), the lookup returns a truthy value that short-circuits the ?? options.other fallback, and the downstream iterator crashes with TypeError: nodes is not iterable. Any consumer that forwards user input into a {arg, select, …} placeholder — a common idiom for role, status, type, gender — can be crashed per-request by supplying one of those keys. In Next.js SSR (via next-intl with experimental.messages.precompile) this yields a 500 for the affected render.

References

  • github.com/advisories/GHSA-r27j-894h-3w3p
  • github.com/amannn/next-intl/security/advisories/GHSA-r27j-894h-3w3p

Code Behaviors & Features

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Affected versions

All versions before 4.9.2

Fixed versions

  • 4.9.2

Solution

Upgrade to version 4.9.2 or above.

Impact 3.7 LOW

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

Learn more about CVSS

Weakness

  • CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Source file

npm/icu-minify/GHSA-r27j-894h-3w3p.yml

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