Vulnerability Description
An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15. `django.core.mail.backends.smtp.EmailBackend` in Django fails to prevent reuse of a partially-initialized connection after a failed `STARTTLS` handshake when `fail_silently=True`, which allows on-path network attackers to read email content via cleartext interception. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Kasper Dupont for reporting this issue.
CVSS Score
LOW
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Djangoproject | Django | >= 5.2, < 5.2.15 |
Related Weaknesses (CWE)
References
- https://docs.djangoproject.com/en/dev/releases/security/PatchVendor Advisory
- https://groups.google.com/g/django-announceRelease Notes
- https://www.djangoproject.com/weblog/2026/jun/03/security-releases/PatchVendor Advisory
FAQ
What is CVE-2026-7666?
CVE-2026-7666 is a vulnerability with a CVSS score of 3.1 (LOW). An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15. `django.core.mail.backends.smtp.EmailBackend` in Django fails to prevent reuse of a partially-initialized connection after a f...
How severe is CVE-2026-7666?
CVE-2026-7666 has been rated LOW with a CVSS base score of 3.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-7666?
Check the references section above for vendor advisories and patch information. Affected products include: Djangoproject Django.