diff --git a/policy/lib/rule_data.rego b/policy/lib/rule_data.rego
index f1f9b643..a65736fa 100644
--- a/policy/lib/rule_data.rego
+++ b/policy/lib/rule_data.rego
@@ -30,7 +30,7 @@ rule_data_defaults := {
 	"warned_tests_results": ["WARNING"],
 	#
 	# Used in release/cve.go
-	# Valid levels: "critical", "high", "medium", and "low"
+	# Valid levels: "critical", "high", "medium", "low", and "unknown"
 	"restrict_cve_security_levels": ["critical", "high"],
 	"warn_cve_security_levels": [],
 	# Used in policy/release/slsa_source_correlated.rego
diff --git a/policy/release/cve.rego b/policy/release/cve.rego
index 4c929297..a57db8a1 100644
--- a/policy/release/cve.rego
+++ b/policy/release/cve.rego
@@ -22,7 +22,7 @@ import data.lib
 #   rule will fail. By default, only CVEs of critical and high security level
 #   cause a failure. This is configurable by the rule data key
 #   `restrict_cve_security_levels`. The available levels are critical, high,
-#   medium, and low.
+#   medium, low, and unknown.
 # custom:
 #   short_name: cve_blockers
 #   failure_msg: Found %d CVE vulnerabilities of %s security level
@@ -48,7 +48,7 @@ deny contains result if {
 #   rule will raise a warning. By default, the list of CVE security levels used
 #   by this policy is empty. However, this is configurable by the rule data key
 #   `warn_cve_security_levels`. The available levels are critical, high,
-#   medium, and low.
+#   medium, low, and unknown.
 # custom:
 #   short_name: cve_warnings
 #   failure_msg: Found %d non-blocking CVE vulnerabilities of %s security level
diff --git a/policy/release/cve_test.rego b/policy/release/cve_test.rego
index 68811e97..4f1b2df5 100644
--- a/policy/release/cve_test.rego
+++ b/policy/release/cve_test.rego
@@ -15,13 +15,13 @@ test_success if {
 		[{
 			"name": cve._result_name,
 			"type": "string",
-			"value": {"vulnerabilities": {"critical": 0, "high": 0, "medium": 20, "low": 300}},
+			"value": {"vulnerabilities": _dummy_counts_zero_high},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			cve._result_name,
-			{"vulnerabilities": {"critical": 0, "high": 0, "medium": 20, "low": 300}},
+			{"vulnerabilities": _dummy_counts_zero_high},
 			"clair-scan",
 			_bundle,
 		),
@@ -36,13 +36,13 @@ test_success_with_rule_data if {
 		[{
 			"name": cve._result_name,
 			"type": "string",
-			"value": {"vulnerabilities": {"critical": 1, "high": 1, "medium": 20, "low": 300}},
+			"value": {"vulnerabilities": _dummy_counts},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			cve._result_name,
-			{"vulnerabilities": {"critical": 1, "high": 1, "medium": 20, "low": 300}},
+			{"vulnerabilities": _dummy_counts},
 			"clair-scan",
 			_bundle,
 		),
@@ -58,13 +58,13 @@ test_failure if {
 		[{
 			"name": cve._result_name,
 			"type": "string",
-			"value": {"vulnerabilities": {"critical": 1, "high": 10, "medium": 20, "low": 300}},
+			"value": {"vulnerabilities": _dummy_counts},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			cve._result_name,
-			{"vulnerabilities": {"critical": 1, "high": 10, "medium": 20, "low": 300}},
+			{"vulnerabilities": _dummy_counts},
 			"clair-scan",
 			_bundle,
 		),
@@ -125,13 +125,13 @@ test_warn if {
 		[{
 			"name": cve._result_name,
 			"type": "string",
-			"value": {"vulnerabilities": {"critical": 1, "high": 10, "medium": 20, "low": 300}},
+			"value": {"vulnerabilities": _dummy_counts},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			cve._result_name,
-			{"vulnerabilities": {"critical": 1, "high": 10, "medium": 20, "low": 300}},
+			{"vulnerabilities": _dummy_counts},
 			"clair-scan",
 			_bundle,
 		),
@@ -146,13 +146,13 @@ test_warn_with_rule_data if {
 		[{
 			"name": cve._result_name,
 			"type": "string",
-			"value": {"vulnerabilities": {"critical": 1, "high": 10, "medium": 20, "low": 300}},
+			"value": {"vulnerabilities": _dummy_counts},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			cve._result_name,
-			{"vulnerabilities": {"critical": 1, "high": 10, "medium": 20, "low": 300}},
+			{"vulnerabilities": _dummy_counts},
 			"clair-scan",
 			_bundle,
 		),
@@ -169,9 +169,14 @@ test_warn_with_rule_data if {
 			"term": "low",
 			"msg": "Found 300 non-blocking CVE vulnerabilities of low security level",
 		},
+		{
+			"code": "cve.cve_warnings",
+			"term": "unknown",
+			"msg": "Found 2 non-blocking CVE vulnerabilities of unknown security level",
+		},
 	}
 	lib.assert_equal_results(cve.warn, expected) with input.attestations as attestations
-		with data.rule_data.warn_cve_security_levels as ["medium", "low"]
+		with data.rule_data.warn_cve_security_levels as ["medium", "low", "unknown"]
 }
 
 test_missing_cve_scan_result if {
@@ -180,13 +185,13 @@ test_missing_cve_scan_result if {
 		[{
 			"name": "WRONG_RESULT_NAME",
 			"type": "string",
-			"value": {"vulnerabilities": {"critical": 1, "high": 1, "medium": 20, "low": 300}},
+			"value": {"vulnerabilities": _dummy_counts},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			"WRONG_RESULT_NAME",
-			{"vulnerabilities": {"critical": 1, "high": 1, "medium": 20, "low": 300}},
+			{"vulnerabilities": _dummy_counts},
 			"clair-scan",
 			_bundle,
 		),
@@ -205,13 +210,13 @@ test_missing_cve_scan_vulnerabilities if {
 		[{
 			"name": cve._result_name,
 			"type": "string",
-			"value": {"seitilibarenluv": {"critical": 1, "high": 1, "medium": 20, "low": 300}},
+			"value": {"seitilibarenluv": _dummy_counts},
 		}],
 	)
 	attestations := [
 		lib_test.att_mock_helper_ref(
 			cve._result_name,
-			{"seitilibarenluv": {"critical": 1, "high": 1, "medium": 20, "low": 300}},
+			{"seitilibarenluv": _dummy_counts},
 			"clair-scan",
 			_bundle,
 		),
@@ -225,3 +230,7 @@ test_missing_cve_scan_vulnerabilities if {
 }
 
 _bundle := "registry.img/spam@sha256:4e388ab32b10dc8dbc7e28144f552830adc74787c1e2c0824032078a79f227fb"
+
+_dummy_counts := {"critical": 1, "high": 10, "medium": 20, "low": 300, "unknown": 2}
+
+_dummy_counts_zero_high := {"critical": 0, "high": 0, "medium": 20, "low": 300, "unknown": 2}