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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: NVD (National Vulnerability Database)
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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
CWE-1321
Source: NVD (National Vulnerability Database)
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
VendorProductAffected VersionsCPESubscribe
elysiajselysia < 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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IV. Related Vulnerabilities
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