CVE-2026-31865Elysia is a Typescript framework for request validation, type inference, OpenAPI documentation, and client-server communication.
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- Weakness (CWE)
- CWE-1321
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Not given
- NVD analysis
- Analyzed
- Record last updated
- Jun 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
elysiajs elysia elysiajs:elysia | before 1.4.27 | NVD |
References
- https://github.com/elysiajs/elysia/commit/e9d6b1743fa7368ef942dce181f6a089757f6aabpatch
- https://github.com/elysiajs/elysia/security/advisories/GHSA-8hq9-phh3-p2wpmitigation, patch, vendor-advisory
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.