Moderate severityNVD Advisory· Published Mar 18, 2026· Updated Mar 18, 2026
Elysia Cookie Value Prototype Pollution
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
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
elysianpm | < 1.4.27 | 1.4.27 |
Affected products
2Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-8hq9-phh3-p2wpghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-31865ghsaADVISORY
- github.com/elysiajs/elysia/commit/e9d6b1743fa7368ef942dce181f6a089757f6aabghsax_refsource_MISCWEB
- github.com/elysiajs/elysia/security/advisories/GHSA-8hq9-phh3-p2wpghsax_refsource_CONFIRMWEB
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