fix: add data migration to fix existing malformed cvss vectors

Signed-off-by: Keshav Priyadarshi <git@keshav.space>

Author: keshav-space

vulnerabilities/migrations/0138_fix_malformed_cvss_vector.py

@@ -0,0 +1,41 @@
+# Generated by Django 5.2.11 on 2026-06-30 08:15
+
+from django.db import migrations
+from django.db.models import Value
+from django.db.models.functions import Concat
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+        ("vulnerabilities", "0137_alter_pipelineschedule_run_interval"),
+    ]
+
+    def fix_malformed_cvss_severity(apps, schema_editor):
+        AdvisorySeverity = apps.get_model("vulnerabilities", "AdvisorySeverity")
+
+        AdvisorySeverity.objects.filter(
+            scoring_system="cvssv3.1",
+            scoring_elements__startswith="CVSS:3.0/",
+        ).update(scoring_system="cvssv3")
+
+        AdvisorySeverity.objects.filter(
+            scoring_system="cvssv3",
+            scoring_elements__isnull=False,
+        ).exclude(
+            scoring_elements="",
+        ).exclude(
+            scoring_elements__startswith="CVSS:3.0/",
+        ).update(
+            scoring_elements=Concat(
+                Value("CVSS:3.0/"),
+                "scoring_elements",
+            )
+        )
+
+    operations = [
+        migrations.RunPython(
+            fix_malformed_cvss_severity,
+            reverse_code=migrations.RunPython.noop,
+        ),
+    ]