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GHSA-8hq9-phh3-p2wp

Elysia Cookie Value Prototype Pollution

Source: GitHub Advisory Database (reviewed) Moderate CVE-2026-31865

Packages

EcosystemPackageAffectedFixed in
npm elysia < 1.4.27 1.4.27

Details

As written in the advisory (Markdown source, shown as plain text).

### 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 iterable over cookie if possible

References

External links from the advisory. They lead to third-party sites.