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