CVE-2025-66456
critical · 9.1Elysia 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 `mergeDeep` 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 `__proto__ prop` to be merged. When combined with GHSA-8vch-m3f4-q8jf this allows for a full RCE by an attacker. This issue is fixed in version 1.4.17. To workaround, remove the `__proto__ key` from body.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Weaknesses
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| elysiajs | elysia | >= 1.4.0, < 1.4.17 |
Check a specific version with /api/v1/cve/match.
References
- https://github.com/elysiajs/elysia/commit/26935bf76ebc43b4a43d48b173fc853de43bb51e
- https://github.com/elysiajs/elysia/commit/3af978663e437dccc6c1a2a3aff4b74e1574849e
- https://github.com/elysiajs/elysia/pull/1564
- https://github.com/elysiajs/elysia/security/advisories/GHSA-8vch-m3f4-q8jf
- https://github.com/elysiajs/elysia/security/advisories/GHSA-hxj9-33pp-j2cc
- https://github.com/elysiajs/elysia/security/advisories/GHSA-8vch-m3f4-q8jf
- https://github.com/elysiajs/elysia/security/advisories/GHSA-hxj9-33pp-j2cc
Query this programmatically:
curl https://evil-db.io/api/v1/cve/CVE-2025-66456