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CVE-2025-66456— Elysia vulnerable to prototype pollution with multiple standalone schema validation

Quick assessment

Affected
elysiajs elysia
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

elysia是elysia开源的一个框架。 elysia 1.4.0版本至1.4.16版本存在安全漏洞，该漏洞源于mergeDeep函数存在原型污染，可能导致远程代码执行。

AI Predicted 9.8 Difficulty: Moderate EPSS 0.56% · P46

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-66456

Vulnerability Information
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Vulnerability Title
Elysia vulnerable to prototype pollution with multiple standalone schema validation
Source: CVE Program / CVE List V5
Vulnerability Description
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 `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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
CWE-1321
Source: CVE Program / CVE List V5
Vulnerability Title
elysia 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
elysia是elysia开源的一个框架。 elysia 1.4.0版本至1.4.16版本存在安全漏洞，该漏洞源于mergeDeep函数存在原型污染，可能导致远程代码执行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
elysiajs elysia >= 1.4.0, < 1.4.17 -

II. Public POCs for CVE-2025-66456

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III. Intelligence Information for CVE-2025-66456

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Patches & Fixes for CVE-2025-66456 (3)

Vendor Advisories for CVE-2025-66456 (2)

IV. Related Vulnerabilities

Same product: elysia
Same vendor: elysiajs
Same weakness: CWE-1321

V. Comments for CVE-2025-66456

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