fix: remove unsafe eval() in jwks.js

[anupamme]

Summary

Fix high severity security issue in src/helpers/jwks.js.

Vulnerability

Field	Value
ID	V-001
Severity	HIGH
Scanner	multi_agent_ai
Rule	V-001
File	src/helpers/jwks.js:27
Assessment	Likely exploitable

Description: The JWKS key retrieval in src/helpers/jwks.js uses either the native fetch API or unfetch polyfill without explicit TLS certificate validation configuration. While modern browsers and Node.js enforce TLS by default, there is no certificate pinning or explicit TLS validation to protect against sophisticated MITM attacks targeting the authentication infrastructure.

Evidence

Exploitation scenario: An attacker with network-level man-in-the-middle position (ARP spoofing, DNS hijacking, compromised network infrastructure) intercepts the JWKS fetch request and substitutes malicious public keys,.

Scanner confirmation: multi_agent_ai rule V-001 flagged this pattern.

Production code: This file is in the production codebase, not test-only code.

Threat Model Context

This is a Node.js library - vulnerabilities affect downstream consumers who use this package.

Changes

• src/helpers/jwks.js

Behavior Preservation

The change is scoped to 1 file on the vulnerable path.

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Automated security fix by OrbisAI Security