CVE-2026-31865 describes a prototype pollution vulnerability in the Elysia Typescript framework, affecting versions prior to 1.4.27. This flaw allows an attacker to override Elysia cookies by manipulating the prototype chain, such as using `__proto__`. Rated as MEDIUM severity (CVSS 5.3), it has a network attack vector with low complexity, requiring no privileges or user interaction, and primarily impacts data integrity. There is currently no evidence of active exploitation, nor are public exploit modules or significant community discussion available.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.4.27CPE matchmatch criteria | cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N
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