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_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.

Database specific

{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/7xxx/CVE-2026-7666.json",
    "cna_assigner": "DSF",
    "cwe_ids": [
        "CWE-319"
    ]
}

References

Affected packages

Git / github.com/django/django

Affected ranges

Type

GIT

Repo

https://github.com/django/django

Events

Introduced

9e7cc2b628fe8fd3895986af9b7fc9525034c1b0

Fixed

21e98408f84d22191e2c7ee4052bdd12d264fd3f

Introduced

36b5f39d9372147f0e758f590e35ee2b2bc317dd

Fixed

ee93f65169c280c9ab3d2ce103dd478c96d05065

Database specific

{
    "source": "CPE_RANGE",
    "cpe": "cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "5.2"
        },
        {
            "fixed": "5.2.15"
        },
        {
            "introduced": "6.0"
        },
        {
            "fixed": "6.0.6"
        }
    ]
}

Affected versions

5.*

5.2

5.2.1

5.2.10

5.2.11

5.2.12

5.2.13

5.2.14

5.2.2

5.2.3

5.2.4

5.2.5

5.2.6

5.2.7

5.2.8

5.2.9

6.*

6.0

6.0.1

6.0.2

6.0.3

6.0.4

6.0.5

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-7666.json"