GHSA-4C35-WCG5-MM9H next-intl has prototype pollution with `experimental.messages.precompile` via attacker-controlled translation catalog keys

Summary setNestedProperty in packages/next-intl/src/extractor/utils.tsx walks a dotted key path and assigns the final value without blocking the reserved keys proto, constructor, or prototype. When the next-intl Next.js plugin is configured with experimental.messages and messages.precompile: true...

next-intl has prototype pollution with `experimental.messages.precompile` via attacker-controlled translation catalog keys

Summary setNestedProperty in packages/next-intl/src/extractor/utils.tsx walks a dotted key path and assigns the final value without blocking the reserved keys proto, constructor, or prototype. When the next-intl Next.js plugin is configured with experimental.messages and messages.precompile: true...