CVE-2026-31865

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-server communication. Prior to version 1.4.27, an Elysia cookie can be overridden by prototype pollution , eg. proto. This issue is patched in 1.4.27. As a workaround, use t.Cookie validatio...

GHSA-8HQ9-PHH3-P2WP Elysia Cookie Value Prototype Pollution

Impact Elysia cookie can be overridden by prototype pollution , eg. proto Sending cookie with the follows name can override cookie value: bash proto=%7B%22injected%22%3A%22polluted%22%7D Patches Patched by 1.4.27 Workarounds 1. Use t.Cookie validation to enforce validation value 2. Prevent iterab...