CVE-2026-30837: Elysiajs Elysia

High severity, CVSS 7.5. EPSS: 0.5% 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 1.4.26 , t.String({ format: 'url' }) is vulnerable to ReDoS. Repeating a partial url format (protocol and hostname) multiple times cause regex to slow down significantly. This vulnerability is fixed in 1.4.26.

Affected products

• Elysiajs Elysia: before 1.4.26 (fixed in 1.4.26)

Published 2026-03-10. Last modified 2026-06-17.