What is CVE-2026-7666?

CVE-2026-7666 is a low-severity vulnerability in Djangoproject Django, classified under Cleartext Transmission of Sensitive Information. CVSS score: 3.1/10. Published 2026-06-03.

How severe is CVE-2026-7666?

Low severity. CVSS v3 base score is 3.1 out of 10.

Vulnerability in Djangoproject Django

CVE-2026-7666

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_s…

EPSS: 0.000 (5.1th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 3.1 (Low). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N.

Affected products

Djangoproject Django — versions 6.0, 6.0.6, 5.2

Weakness classification (CWE)

CWE-319 — Cleartext Transmission of Sensitive Information

References

6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (mailing-list, Release Notes)
6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 (vendor-advisory, Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2026-7666?: CVE-2026-7666 is a low-severity vulnerability in Djangoproject Django, classified under Cleartext Transmission of Sensitive Information. CVSS score: 3.1/10. Published 2026-06-03.
How severe is CVE-2026-7666?: Low severity. CVSS v3 base score is 3.1 out of 10.