GHSA-mm6v-q8q9-pgcf
Django fails to prevent reuse of a partially-initialized connection after a failed `STARTTLS` handshake
At a glance
- Published
- Updated
- CVE
- CVE-2026-7666
- Aliases
- BIT-django-2026-7666, PYSEC-2026-200
- CVSS_V3
- CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
- CVSS_V4
- CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
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.
Affected packages
| Package | Versions |
|---|---|
| PyPI · django | introduced 5.2, fixed 5.2.15 |
| PyPI · django | introduced 6.0, fixed 6.0.6 |
References
- https://nvd.nist.gov/vuln/detail/CVE-2026-7666 ADVISORY
- https://docs.djangoproject.com/en/dev/releases/security WEB
- https://github.com/django/django PACKAGE
- https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2026-200.yaml WEB
- https://groups.google.com/g/django-announce WEB
- https://www.djangoproject.com/weblog/2026/jun/03/security-releases WEB
Sources
| Source | Licence |
|---|---|
| OSV.dev | CC-BY 4.0 — GitHub Advisory Database |