diff --git a/tests/data_files/Makefile b/tests/data_files/Makefile
index 30c65ff54..14cf5ae8d 100644
--- a/tests/data_files/Makefile
+++ b/tests/data_files/Makefile
@@ -565,6 +565,9 @@ authorityKeyId_empty.crt.der:
 authorityKeyId_subjectKeyId_tag_malformed.crt.der: authorityKeyId_subjectKeyId.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/0414A505E864B8DCDF600F50124D60A864AF4D8B4393/0114A505E864B8DCDF600F50124D60A864AF4D8B4393/" | xxd -r -p > $@
 
+authorityKeyId_subjectKeyId_tag_len_malformed.crt.der: authorityKeyId_subjectKeyId.crt.der
+	hexdump -ve '1/1 "%.2X"' $< | sed "s/0414A505E864B8DCDF600F50124D60A864AF4D8B4393/0413A505E864B8DCDF600F50124D60A864AF4D8B4393/" | xxd -r -p > $@
+
 authorityKeyId_subjectKeyId_length_malformed.crt.der: authorityKeyId_subjectKeyId.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/306D8014A505E864B8DC/306C8014A505E864B8DC/" | xxd -r -p > $@
 
@@ -583,6 +586,12 @@ authorityKeyId_subjectKeyId_issuer_tag1_malformed.crt.der: authorityKeyId_subjec
 authorityKeyId_subjectKeyId_issuer_tag2_malformed.crt.der: authorityKeyId_subjectKeyId.crt.der
 	hexdump -ve '1/1 "%.2X"' $< | sed "s/A43D303B310B30090603/003D303B310B30090603/" | xxd -r -p > $@
 
+authorityKeyId_subjectKeyId_sn_tag_malformed.crt.der: authorityKeyId_subjectKeyId.crt.der
+	hexdump -ve '1/1 "%.2X"' $< | sed "s/8214680430CD074DE63F/8114680430CD074DE63F/" | xxd -r -p > $@
+
+authorityKeyId_subjectKeyId_sn_len_malformed.crt.der: authorityKeyId_subjectKeyId.crt.der
+	hexdump -ve '1/1 "%.2X"' $< | sed "s/8214680430CD074DE63F/8213680430CD074DE63F/" | xxd -r -p > $@
+
 ################################################################
 #### Generate various RSA keys
 ################################################################
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_sn_len_malformed.crt.der b/tests/data_files/authorityKeyId_subjectKeyId_sn_len_malformed.crt.der
new file mode 100644
index 000000000..009fcf292
Binary files /dev/null and b/tests/data_files/authorityKeyId_subjectKeyId_sn_len_malformed.crt.der differ
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_sn_tag_malformed.crt.der b/tests/data_files/authorityKeyId_subjectKeyId_sn_tag_malformed.crt.der
new file mode 100644
index 000000000..93fb1e30b
Binary files /dev/null and b/tests/data_files/authorityKeyId_subjectKeyId_sn_tag_malformed.crt.der differ
diff --git a/tests/data_files/authorityKeyId_subjectKeyId_tag_len_malformed.crt.der b/tests/data_files/authorityKeyId_subjectKeyId_tag_len_malformed.crt.der
new file mode 100644
index 000000000..89e1f4b98
Binary files /dev/null and b/tests/data_files/authorityKeyId_subjectKeyId_tag_len_malformed.crt.der differ
diff --git a/tests/suites/test_suite_x509parse.data b/tests/suites/test_suite_x509parse.data
index 25576f48a..365a58c54 100644
--- a/tests/suites/test_suite_x509parse.data
+++ b/tests/suites/test_suite_x509parse.data
@@ -3309,6 +3309,10 @@ X509 CRT parse Subject Key Id - Wrong OCTET_STRING tag
 depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
 x509_crt_parse_subjectkeyid:"data_files/authorityKeyId_subjectKeyId_tag_malformed.crt.der":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
 
+X509 CRT parse Subject Key Id - Wrong OCTET_STRING tag
+depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
+x509_crt_parse_subjectkeyid:"data_files/authorityKeyId_subjectKeyId_tag_len_malformed.crt.der":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
+
 X509 CRT parse Authority Key Id - Correct Authority Key ID
 depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
 x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId.crt.der":"A505E864B8DCDF600F50124D60A864AF4D8B4393":"NL/PolarSSL/PolarSSL Test CA/":"680430CD074DE63FCDC051260FD042C2B512B6BA":0
@@ -3349,7 +3353,15 @@ X509 CRT parse Authority Key Id - Wrong Issuer Tag 2
 depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
 x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_issuer_tag2_malformed.crt.der":"":"":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
 
+X509 CRT parse Authority Key Id - Wrong Serial Number Tag
+depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_sn_tag_malformed.crt.der":"":"":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_UNEXPECTED_TAG
+
+X509 CRT parse Authority Key Id - Wrong Serial Number Tag length
+depends_on:MBEDTLS_MD_CAN_SHA256:MBEDTLS_RSA_C
+x509_crt_parse_authoritykeyid:"data_files/authorityKeyId_subjectKeyId_sn_len_malformed.crt.der":"":"":"":MBEDTLS_ERR_X509_INVALID_EXTENSIONS+MBEDTLS_ERR_ASN1_LENGTH_MISMATCH
+
 # clusterfuzz-testcase-minimized-fuzz_x509crt-6666050834661376: test for bad sequence of names in authorityCertIssuer
 X509 CRT parse Authority Key Id - Wrong Issuer sequence
 depends_on:MBEDTLS_MD_CAN_MD5:MBEDTLS_RSA_C
-x509_crt_parse_authoritykeyid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
+x509_crt_parse_authoritykeyid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
\ No newline at end of file