Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication.

Code

The project this record applies to. Exploit listings stay in References.

• Repository · github.com

Timeline

Detection, updates, and resolution for this record.

1. Dec 9, 2025 · NIST NVD

   Detected

   Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Versions 1.4.0 through 1.4.16 contain a prototype pollution vulnerability in after merging results of two standard schema validations with the same key. Due to the ordering of merging, there must be an any type that is set as a standalone guard, to allow for the to be mer

2. Oct 14, 2026 · NIST NVD

   Updated

   Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Versions 1.4.0 through 1.4.16 contain a prototype pollution vulnerability in after merging results of two standard schema validations with the same key. Due to the ordering of merging, there must be an any type that is set as a standalone guard, to allow for the to be mer

Affected

• cpe elysiajs/elysiaversion unspecified

Sources

• CVE.orgVulnerability recordCVE-2025-66456

  Official CVE identifier

  cve.org
• FIRST EPSSExploitation probabilityCVE-2025-66456

  30-day exploitation probability 0.6%

  first.org
• NIST NVDVulnerability recordCVE-2025-66456

  Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Versions 1.4.0 through 1.4.16 contain a prototype pollution vulnerability in after merging results of two standard schema validations with t

  nvd.nist.gov

References

• Patch · github.com
• Patch · github.com
• Issue Tracking · github.com
• Not Applicable · github.com
• Exploit · github.com