Medium severity6.5NVD Advisory· Published Mar 18, 2026· Updated Jun 17, 2026

CVE-2026-31865

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.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected packages

Versions sourced from the GitHub Security Advisory.

Package	Affected versions	Patched versions
elysianpm	< 1.4.27	1.4.27

Affected products

Elysiajs/Elysia2 versions
cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:*+ 1 more
- cpe:2.3:a:elysiajs:elysia:*:*:*:*:*:node.js:*:*range: <1.4.27
- (no CPE)range: < 1.4.27
ghsa-coords
pkg:npm/elysia
Range: < 1.4.27

Patches

Vulnerability mechanics

References

github.com/elysiajs/elysia/commit/e9d6b1743fa7368ef942dce181f6a089757f6aabnvdPatchWEB
github.com/elysiajs/elysia/security/advisories/GHSA-8hq9-phh3-p2wpnvdMitigationPatchVendor AdvisoryWEB
github.com/advisories/GHSA-8hq9-phh3-p2wpghsaADVISORY
nvd.nist.gov/vuln/detail/CVE-2026-31865ghsaADVISORY

News mentions

No linked articles in our index yet.

cvss	0.423
epss	0.000
exploit	0.000
kev	0.000
patch	-0.070
ransomware	0.000