VulnerabilityAnalyzed
CVE-2026-31865
Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-server communication.
MEDIUM 5.3EPSS 0.23%
Does this matter?
Lower severity and a low EPSS score (0.23%). Track it; it rarely justifies an emergency change on its own.
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.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- EPSS
- 0.23% probability · 14th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-1321
- Affected
- elysiajs/elysia
- Source
- security-advisories@github.com
References
- https://github.com/elysiajs/elysia/commit/e9d6b1743fa7368ef942dce181f6a089757f6aabPatch
- https://github.com/elysiajs/elysia/security/advisories/GHSA-8hq9-phh3-p2wpMitigation, Patch, Vendor Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.