Is CVE-2026-31865 actively exploited?

No active exploitation of CVE-2026-31865 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2026-31865 be exploited remotely?

Yes. CVE-2026-31865 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2026-31865?

CVE-2026-31865 has a CVSS score of 5.3 (MEDIUM).

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MEDIUM

CVE-2026-31865

CWE-1321Published: March 18, 2026· Updated: Mar 20, 2026

5.3

CVSS v3.1

EPSS:0.03%probability of exploitation in 30 daysPercentile:8.1th

Official 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.

NVD Source

Technical Analysis

CVE-2026-31865 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.