CVE-2025-66457

Description

Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation and client-server communication. Versions 1.4.17 and below are subject to arbitrary code execution from cookie config. When dynamic cookies are enabled (e.g. there an existing cookie schema), the cookie config is injected into the compiled route without first being sanitised. Availability of this exploit is generally low, but when combined with GHSA-hxj9-33pp-j2cc, it allows for a full RCE chain. An attack requires write access to either the Elysia app's source code (in which case the vulnerability is meaningless) or write access to the cookie config (perhaps where it is assumed to be provisioned by the environment). This issue is fixed in version 1.4.18.

PUBLISHED Reserved 2025-12-01 | Published 2025-12-09 | Updated 2025-12-12 | Assigner GitHub_M

Problem types

CWE-94: Improper Control of Generation of Code ('Code Injection')

Product status

References

github.com/sportshead/elysia-poc exploit

github.com/...elysia/security/advisories/GHSA-8vch-m3f4-q8jf

github.com/...elysia/security/advisories/GHSA-hxj9-33pp-j2cc

github.com/elysiajs/elysia/pull/1564

github.com/...ommit/26935bf76ebc43b4a43d48b173fc853de43bb51e

github.com/...ommit/3af978663e437dccc6c1a2a3aff4b74e1574849e

cve.org (CVE-2025-66457)

nvd.nist.gov (CVE-2025-66457)

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