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GHSA-mm6v-q8q9-pgcf

Django fails to prevent reuse of a partially-initialized connection after a failed `STARTTLS` handshake

Source: GitHub Advisory Database (reviewed) Low CVE-2026-7666

Packages

EcosystemPackageAffectedFixed in
PyPI django >= 5.2, < 5.2.15 5.2.15
PyPI django >= 6.0, < 6.0.6 6.0.6

Details

As written in the advisory (Markdown source, shown as plain text).

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.

References

External links from the advisory. They lead to third-party sites.