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CVE-2026-31865— Elysia Cookie Value Prototype Pollution

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 1.4.27之前版本存在安全漏洞，该漏洞源于Elysia cookie可能被原型污染覆盖，可能导致安全问题。

CVSS 6.5 · Medium EPSS 0.34% · P27

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-31865

Vulnerability Information
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Vulnerability Title
Elysia Cookie Value Prototype Pollution
Source: CVE Program / CVE List V5
Vulnerability Description
Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-server communication. Prior to version 1.4.27, an Elysia cookie can be overridden by prototype pollution , eg. `__proto__`. This issue is patched in 1.4.27. As a workaround, use t.Cookie validation to enforce validation value and/or prevent iterable over cookie if possible.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A: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 1.4.27之前版本存在安全漏洞，该漏洞源于Elysia cookie可能被原型污染覆盖，可能导致安全问题。
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 < 1.4.27 -

II. Public POCs for CVE-2026-31865

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III. Intelligence Information for CVE-2026-31865

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Patches & Fixes for CVE-2026-31865 (1)

Vendor Advisories for CVE-2026-31865 (1)

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-31865

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