diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 521e4a2..8cc757a 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -76,8 +76,9 @@
 server7-future.crt: server7.csr $(test_ca_int_rsa1)
 	$(FAKETIME) -f +3653d $(OPENSSL) x509 -req -extfile $(cli_crt_extensions_file) -extensions cli-rsa -CA $(test_ca_int_rsa1) -CAkey test-int-ca.key -set_serial 16 -days 3653 -sha256 -in server7.csr | cat - $(test_ca_int_rsa1) > $@
 all_final += server7-future.crt
-
-
+server7-badsign.crt: server7.crt $(test_ca_int_rsa1)
+	{ head -n-2 server7.crt; tail -n-2 server7.crt | sed -e '1s/0\(=*\)$$/_\1/' -e '1s/[^_=]\(=*\)$$/0\1/' -e '1s/_/1/'; cat test-int-ca.crt; } > server7-badsign.crt
+all_final += server7-badsign.crt
 
 ################################################################
 #### Meta targets
diff --git a/tests/data_files/server7-badsign.crt b/tests/data_files/server7-badsign.crt
new file mode 100644
index 0000000..954b53a
--- /dev/null
+++ b/tests/data_files/server7-badsign.crt
@@ -0,0 +1,47 @@
+-----BEGIN CERTIFICATE-----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++gjlEO0mgt/87XpjYOig1o0jv44QYDQZQzpj1zeIn6WMe6xk9YDwCLMjRIpg++c7
+QyxvcEJTn80wX1SaEBM2gau97G7bORLMwBVkMT4oSY+iKYgpPpawOnMJbqUP73Dm
+yfJExDdrW/BbWZ/vKIcSqSZIbkHdkNjUDVHczyVwQxZxzvLFw/B1k9s7jYFsi5eK
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+0b6YDNe5IvdKk8iwz3mof0VNy47K6xoCaE/fxxWkjoXK8x2wfswGeP2QgUzQE93b
+OtjdHpsG1c7gIVFQmKATyAPUz4vqmezgNRleXU0oL0PYtoCmKQ51UjNMUfmO9xCj
+VJaNa2iTQ5Dgic+CW4TYAgj5/9g9X3WfwnDNxrZ0UxxawGElczHXqbrNleTtPaKp
+a8Si6UK0
+-----END CERTIFICATE-----
+-----BEGIN CERTIFICATE-----
+MIIEATCCA4egAwIBAgIBDjAKBggqhkjOPQQDAjA+MQswCQYDVQQGEwJOTDERMA8G
+A1UEChMIUG9sYXJTU0wxHDAaBgNVBAMTE1BvbGFyc3NsIFRlc3QgRUMgQ0EwHhcN
+MTMwOTI0MTU1NTE0WhcNMjMwOTIyMTU1NTE0WjBIMQswCQYDVQQGEwJOTDERMA8G
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+YXRlIENBMIICIjANBgkqhkiG9w0BAQEFAAOCAg8AMIICCgKCAgEAo1Oc8nr6fMTq
+vowV+CpC55i5BZGFGc50Eb4RLBSRTH1e7JepdFjAVbBtyQRJSiY1ja0tgLQDDKZR
+wfEI+b4azse460InPHv7C1TN0upXlxuj6m9B1IlP+sBaM7WBC6dVfPO+jVMIxgkF
+CaBCLhhdK1Fjf8HjkT/PkctWnho8NTwivc9+nqRZjXe/eIcqm5HwjDDhu+gz+o0g
+Vz9MfZNi1JyCrOyNZcy+cr2QeNnNVGnFq8xTxtu6dLunhpmLFj2mm0Vjwa7Ypj5q
+AjpqTMtDvqbRuToyoyzajhMNcCAf7gwzIupJJFVdjdtgYAcQwzikwF5HoITJzzJ2
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+Np0MSQd+o22PQ4xRtmP6UsTfU0ueiMpYc8TYYhMbfnfFyo4m707ebcflPbBEN2dg
+updQ66cvfCJB0QJt9upafY0lpdV1qUkCAwEAAaOBoDCBnTAdBgNVHQ4EFgQUOHfY
+a3ecKHeCi07YG6ke95QWtw4wbgYDVR0jBGcwZYAUnW0gJEkBPyvLeLUZvH4kydv7
+NnyhQqRAMD4xCzAJBgNVBAYTAk5MMREwDwYDVQQKEwhQb2xhclNTTDEcMBoGA1UE
+AxMTUG9sYXJzc2wgVGVzdCBFQyBDQYIJAMFD4n5iQ8zoMAwGA1UdEwQFMAMBAf8w
+CgYIKoZIzj0EAwIDaAAwZQIxAPyE+u+eP7gRrSFjQicmpYg8jiFUCYEowWY2zuOG
+i1HXYwmpDHfasQ3rNSuf/gHvjwIwbSSjumDk+uYNci/KMELDsD0MFHxZhhBc9Hp9
+Af5cNR8KhzegznL6amRObGGKmX1F
+-----END CERTIFICATE-----
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index e497869..b0445e0 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -575,6 +575,10 @@
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_SHA1_C
 x509_verify:"data_files/server2-badsign.crt":"data_files/test-ca.crt":"data_files/crl.pem":"NULL":MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:MBEDTLS_X509_BADCERT_NOT_TRUSTED:"compat":"NULL"
 
+X509 Certificate verification #45b (Corrupted signature, intermediate CA)
+depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_RSA_C:MBEDTLS_PKCS1_V15:MBEDTLS_SHA1_C:MBEDTLS_ECP_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_SHA256_C
+x509_verify:"data_files/server7-badsign.crt":"data_files/test-ca2.crt":"data_files/crl.pem":"NULL":MBEDTLS_ERR_X509_CERT_VERIFY_FAILED:MBEDTLS_X509_BADCERT_NOT_TRUSTED:"compat":"NULL"
+
 X509 Certificate verification #46 (Valid, depth 2, EC-RSA-EC)
 depends_on:MBEDTLS_PEM_PARSE_C:MBEDTLS_ECDSA_C:MBEDTLS_RSA_C:MBEDTLS_ECP_DP_SECP256R1_ENABLED:MBEDTLS_ECP_DP_SECP384R1_ENABLED:MBEDTLS_PKCS1_V15:MBEDTLS_SHA256_C
 x509_verify:"data_files/server7_int-ca.crt":"data_files/test-ca2.crt":"data_files/crl-ec-sha256.pem":"NULL":0:0:"compat":"NULL"