CVE-2026-31865

MEDIUM EPSS 14.0%
Published Mar 18, 20263mo ago · Modified Jun 17, 20262w ago
5.3 CVSS 3.1
Medium
Find Similar
Published Mar 18, 2026 3mo ago
Last Modified Jun 17, 2026 2w ago

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 Details

Base Score
5.3
Exploitability
3.9
Impact
1.4
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality None
Integrity Low
Availability None

Threat Intelligence

EPSS Exploit Probability
14.0% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-1321

Affected Products 1

VendorProductVersionRange
elysiajselysia* <1.4.27

References 2

  • github.com https://github.com/elysiajs/elysia/commit/e9d6b1743fa7368ef942dce181f6a089757f6aab
    Patch
  • github.com https://github.com/elysiajs/elysia/security/advisories/GHSA-8hq9-phh3-p2wp
    MitigationPatchVendor Advisory

Remediation

  • github.com https://github.com/elysiajs/elysia/commit/e9d6b1743fa7368ef942dce181f6a089757f6aab
    Patch
  • github.com https://github.com/elysiajs/elysia/security/advisories/GHSA-8hq9-phh3-p2wp
    MitigationPatchVendor Advisory