2 files changed, 20 insertions, 1 deletions
diff --git a/src/crypto/x509/verify.go b/src/crypto/x509/verify.go
index 345d434453..56a1a1725c 100644
--- a/src/crypto/x509/verify.go
+++ b/src/crypto/x509/verify.go
@@ -899,7 +899,7 @@ func (c *Certificate) buildChains(currentChain []*Certificate, sigChecks *int, o
 	)
 
 	considerCandidate := func(certType int, candidate *Certificate) {
-		if alreadyInChain(candidate, currentChain) {
+		if candidate.PublicKey == nil || alreadyInChain(candidate, currentChain) {
 			return
 		}
 
diff --git a/src/crypto/x509/verify_test.go b/src/crypto/x509/verify_test.go
index 37f13f861f..6d09d24da2 100644
--- a/src/crypto/x509/verify_test.go
+++ b/src/crypto/x509/verify_test.go
@@ -2718,3 +2718,22 @@ func TestVerifyEKURootAsLeaf(t *testing.T) {
 	}
 
 }
+
+func TestVerifyNilPubKey(t *testing.T) {
+	c := &Certificate{
+		RawIssuer:      []byte{1, 2, 3},
+		AuthorityKeyId: []byte{1, 2, 3},
+	}
+	opts := &VerifyOptions{}
+	opts.Roots = NewCertPool()
+	r := &Certificate{
+		RawSubject:   []byte{1, 2, 3},
+		SubjectKeyId: []byte{1, 2, 3},
+	}
+	opts.Roots.AddCert(r)
+
+	_, err := c.buildChains([]*Certificate{r}, nil, opts)
+	if _, ok := err.(UnknownAuthorityError); !ok {
+		t.Fatalf("buildChains returned unexpected error, got: %v, want %v", err, UnknownAuthorityError{})
+	}
+}