CVE-2026-7666
Low
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.
SeverityLow
CVSS3.1
Exploit probability—
Product
Django
PublishedJun 3, 2026
First seenJun 3, 2026
Weakness typeCWE-319CWE-319
How to fix
Update
- djangoproject django5.2.15, 6.0.6 or later
- django5.2.15, 6.0.6 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| djangoproject django | 5.2 ≤ v < 5.2.15, 6.0 ≤ v < 6.0.6 | 5.2.15, 6.0.6 |
| djangoPyPI | 5.2 ≤ v < 5.2.15, 6.0 ≤ v < 6.0.6 | 5.2.15, 6.0.6 |
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