CVE-2026-7666

Name	CVE-2026-7666
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.
Source	CVE (at NVD; CERT, ENISA, LWN, oss-sec, fulldisc, Debian ELTS, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
Debian Bugs	1138775

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
python-django (PTS)	bullseye	2:2.2.28-1~deb11u2	vulnerable
	bullseye (security)	2:2.2.28-1~deb11u12	vulnerable
	bookworm, bookworm (security)	3:3.2.25-0+deb12u2	vulnerable
	trixie (security), trixie	3:4.2.28-0+deb13u1	vulnerable
	forky	3:4.2.30-1	vulnerable
	sid	3:5.2.15-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
python-django	source	(unstable)	3:5.2.15-1			1138775

Notes

[trixie] - python-django <no-dsa> (Minor issue)
[bookworm] - python-django <no-dsa> (Minor issue)
[bullseye] - python-django <postponed> (Minor issue)
https://www.djangoproject.com/weblog/2026/jun/03/security-releases/
Fixed by: https://github.com/django/django/commit/4e47d2b800435bcbfd1301ef3250b9c7fb8fa670 (5.2.15)