diff --git a/library/pkparse.c b/library/pkparse.c
index a47815b846..91d6eb59ea 100644
--- a/library/pkparse.c
+++ b/library/pkparse.c
@@ -851,6 +851,15 @@ int mbedtls_pk_parse_subpubkey(unsigned char **p, const unsigned char *end,
 #if defined(MBEDTLS_RSA_C)
     if (pk_alg == MBEDTLS_PK_RSA) {
         ret = mbedtls_rsa_parse_pubkey(mbedtls_pk_rsa(*pk), *p, (size_t) (end - *p));
+        if (ret == 0) {
+            /* On success all the input has been consumed by the parsing function. */
+            *p += end - *p;
+        } else if (ret & 0x7f) {
+            /* In case of ASN1 error codes add MBEDTLS_ERR_PK_INVALID_PUBKEY. */
+            ret = MBEDTLS_ERROR_ADD(MBEDTLS_ERR_PK_INVALID_PUBKEY, ret);
+        } else {
+            ret = MBEDTLS_ERR_PK_INVALID_PUBKEY;
+        }
     } else
 #endif /* MBEDTLS_RSA_C */
 #if defined(MBEDTLS_PK_HAVE_ECC_KEYS)
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 6e201259cf..261c220ee6 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -1774,15 +1774,15 @@ x509parse_crt:"307d3068a0030201008204deadbeef300d06092a864886f70d01010b0500300c3
 
 X509 CRT ASN1 (TBS, inv SubPubKeyInfo, inv internal bitstring length)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_MD_CAN_SHA256
-x509parse_crt:"308180306ba0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a300806001304546573743015300d06092A864886F70D0101010500030400300000300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
+x509parse_crt:"308180306ba0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a300806001304546573743015300d06092A864886F70D0101010500030400300000300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_PK_INVALID_PUBKEY + MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
 
 X509 CRT ASN1 (TBS, inv SubPubKeyInfo, inv internal bitstring tag)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_MD_CAN_SHA256
-x509parse_crt:"308180306ba0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a300806001304546573743015300d06092A864886F70D0101010500030400310000300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+x509parse_crt:"308180306ba0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a300806001304546573743015300d06092A864886F70D0101010500030400310000300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_PK_INVALID_PUBKEY + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
 
 X509 CRT ASN1 (TBS, inv SubPubKeyInfo, inv RSA modulus)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_MD_CAN_SHA256
-x509parse_crt:"3081873072a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374301c300d06092A864886F70D0101010500030b0030080202ffff0302ffff300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+x509parse_crt:"3081873072a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374301c300d06092A864886F70D0101010500030b0030080202ffff0302ffff300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_PK_INVALID_PUBKEY + MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
 
 X509 CRT ASN1 (TBS, inv SubPubKeyInfo, total length mismatch)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_MD_CAN_SHA256
@@ -1790,11 +1790,11 @@ x509parse_crt:"3081893074a0030201008204deadbeef300d06092a864886f70d01010b0500300
 
 X509 CRT ASN1 (TBS, inv SubPubKeyInfo, check failed)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_MD_CAN_SHA256
-x509parse_crt:"3081873072a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374301c300d06092A864886F70D0101010500030b0030080202ffff0202ffff300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_RSA_BAD_INPUT_DATA
+x509parse_crt:"3081873072a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374301c300d06092A864886F70D0101010500030b0030080202ffff0202ffff300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_PK_INVALID_PUBKEY
 
 X509 CRT ASN1 (TBS, inv SubPubKeyInfo, check failed, expanded length notation)
 depends_on:MBEDTLS_RSA_C:MBEDTLS_MD_CAN_SHA256
-x509parse_crt:"308196308180a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210fffffffffffffffffffffffffffffffe0202ffff300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_RSA_BAD_INPUT_DATA
+x509parse_crt:"308196308180a0030201008204deadbeef300d06092a864886f70d01010b0500300c310a30080600130454657374301c170c303930313031303030303030170c303931323331323335393539300c310a30080600130454657374302a300d06092A864886F70D010101050003190030160210fffffffffffffffffffffffffffffffe0202ffff300d06092a864886f70d01010b0500030200ff":"":MBEDTLS_ERR_PK_INVALID_PUBKEY
 
 # We expect an extension parsing error here because the IssuerID is optional.
 # Hence, if we find an ASN.1 tag doesn't match the IssuerID, we assume the