CVE-2026-33894 node-forge签名伪造漏洞

const forge = require('node-forge'); // Simulate a vulnerable environment check console.log('Testing node-forge version for CVE-2026-33894...'); // Conceptual PoC for demonstrating the verification flaw // In a real exploit, 'sig' would be a mathematically forged blob for e=3 keys function verifySignatureWithLowExponent publicKey, message, forgedSignature) { const md = forge.md.sha1.create(); md.update(message, 'utf8'); // The vulnerable verification logic in node-forge < 1.4.0 // would accept malformed ASN.1 structures with extra garbage bytes try { const isValid = publicKey.verify(md.digest().getBytes(), forgedSignature); if (isValid) { console.log('[+] Signature verified successfully! (Vulnerable)'); } else { console.log('[-] Signature verification failed.'); } return isValid; } catch (e) { console.log('Error during verification: ' + e.message); } } // Note: Generating the actual 'forgedSignature' bytes requires // solving the cubic root equation for the specific padding structure, // which is feasible due to the low exponent (e=3) and weak padding checks.