CVE-2026-56669: Elysiajs Elysia

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-server communication. Prior to 1.4.29, Elysia uses getAll in form data normalization for multipart/form-data endpoints, causing the amount of work to grow quadratically with the number of unique key-value pairs and allowing CPU exhaustion. This issue is fixed in version 1.4.29.

Affected products

• Elysiajs Elysia: before 1.4.29 (fixed in 1.4.29)

Published 2026-07-08. Last modified 2026-07-10.