p PatchFirst

CVE-2026-7666

CVE-2026-7666 · Potential unencrypted email transmission via STARTTLS in the SMTP backend

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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.

CVSS 2.3 · Low · EPSS 0.2% · Fix available

Published
Updated

Stack: system · python

Affected products and versions

  • django

    Versions
    • ≥ 6.0, < 6.0.6: Affected (python)
    • 6.0.6: Not affected (python)
    • ≥ 5.2, < 5.2.15: Affected (python)
    • 5.2.15: Not affected (python)

    Update to 5.2.15; Update to 6.0.6

  • python-django Debian:12

    Versions
    • 3:3.2.19-1
    • 3:3.2.19-1+deb12u1
    • 3:3.2.19-1+deb12u1~bpo11+1
    • 3:3.2.19-1+deb12u2
    • 3:3.2.20-1
    • 3:3.2.20-1.1
    • 3:3.2.21-1
    • 3:3.2.25-0+deb12u1
    • 3:3.2.25-0+deb12u2
    • 3:3.2.25-0+deb12u3
    • 3:3.2.25-0+deb12u4
    • 3:3.2.25-0+deb12u5
    • 3:4.1-1
    • 3:4.1.1-1
    • 3:4.1.2-1
    • 3:4.1.3-1
    • 3:4.1.4-1
    • 3:4.1.5-1
    • 3:4.2-1
    • 3:4.2.1-1
    • 3:4.2.10-1
    • 3:4.2.11-1
    • 3:4.2.13-1
    • 3:4.2.14-1
    • 3:4.2.15-1
    • 3:4.2.15-1~bpo12+1
    • 3:4.2.16-1
    • 3:4.2.17-1
    • 3:4.2.17-2
    • 3:4.2.18-1
    • 3:4.2.18-1~bpo12+1
    • 3:4.2.19-1
    • 3:4.2.19-1~bpo12+1
    • 3:4.2.2-1
    • 3:4.2.20-1
    • 3:4.2.20-1~bpo12+1
    • 3:4.2.21-1
    • 3:4.2.21-1~bpo12+1
    • 3:4.2.22-1
    • 3:4.2.23-1
    • 3:4.2.24-1
    • 3:4.2.25-1
    • 3:4.2.25-2
    • 3:4.2.26-1
    • 3:4.2.27-1
    • 3:4.2.27-2
    • 3:4.2.28-1
    • 3:4.2.29-1
    • 3:4.2.3-1
    • 3:4.2.30-1
    • 3:4.2.4-1
    • 3:4.2.5-1
    • 3:4.2.5-2
    • 3:4.2.6-1
    • 3:4.2.8-1
    • 3:4.2.9-1
    • 3:4.2~alpha1-1
    • 3:4.2~beta1-1
    • 3:4.2~rc1-1
    • 3:5.0-1
    • 3:5.0.1-1
    • 3:5.0.2-1
    • 3:5.0.3-1
    • 3:5.0.4-1
    • 3:5.0.6-1
    • 3:5.0~alpha1-1
    • 3:5.0~rc1-1
    • 3:5.1-1
    • 3:5.1.1-1
    • 3:5.1.2-1
    • 3:5.1.3-1
    • 3:5.1.4-1
    • 3:5.1.5-1
    • 3:5.1~alpha1-1
    • 3:5.1~beta1-1
    • 3:5.1~rc1-1
    • 3:5.2-1
    • 3:5.2.1-1
    • 3:5.2.13-1
    • 3:5.2.14-1
    • 3:5.2.14-2
    • 3:5.2.15-1
    • 3:5.2.15-2
    • 3:5.2.15-2~bpo13+1
    • 3:5.2.16-1
    • 3:5.2.16-1~bpo13+1
    • 3:5.2.17-1
    • 3:5.2.17-2
    • 3:5.2.2-1
    • 3:5.2.3-1
    • 3:5.2.4-1
    • 3:5.2.5-1
    • 3:5.2.6-1
    • 3:5.2~alpha1-1
    • 3:5.2~beta1-1
    • 3:5.2~rc1-1
    • 3:6.0-1
    • 3:6.0.1-1
    • 3:6.0.2-1
    • 3:6.0.3-1
    • 3:6.0.4-1
    • 3:6.0.5-1
    • 3:6.0.6-1
    • 3:6.0~alpha1-1
    • 3:6.0~beta1-1
    • 3:6.0~rc1-1
    • 3:6.1-1
    • 3:6.1.1-1
    • 3:6.1~beta1-1
    • 3:6.1~rc1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Debian:13

    Versions
    • 3:4.2.23-1
    • 3:4.2.24-1
    • 3:4.2.25-1
    • 3:4.2.25-2
    • 3:4.2.26-1
    • 3:4.2.27-0+deb13u1
    • 3:4.2.27-1
    • 3:4.2.27-2
    • 3:4.2.28-0+deb13u1
    • 3:4.2.28-0+deb13u2
    • 3:4.2.28-1
    • 3:4.2.29-1
    • 3:4.2.30-1
    • 3:5.0-1
    • 3:5.0.1-1
    • 3:5.0.2-1
    • 3:5.0.3-1
    • 3:5.0.4-1
    • 3:5.0.6-1
    • 3:5.0~alpha1-1
    • 3:5.0~rc1-1
    • 3:5.1-1
    • 3:5.1.1-1
    • 3:5.1.2-1
    • 3:5.1.3-1
    • 3:5.1.4-1
    • 3:5.1.5-1
    • 3:5.1~alpha1-1
    • 3:5.1~beta1-1
    • 3:5.1~rc1-1
    • 3:5.2-1
    • 3:5.2.1-1
    • 3:5.2.13-1
    • 3:5.2.14-1
    • 3:5.2.14-2
    • 3:5.2.15-1
    • 3:5.2.15-2
    • 3:5.2.15-2~bpo13+1
    • 3:5.2.16-1
    • 3:5.2.16-1~bpo13+1
    • 3:5.2.17-1
    • 3:5.2.17-2
    • 3:5.2.2-1
    • 3:5.2.3-1
    • 3:5.2.4-1
    • 3:5.2.5-1
    • 3:5.2.6-1
    • 3:5.2~alpha1-1
    • 3:5.2~beta1-1
    • 3:5.2~rc1-1
    • 3:6.0-1
    • 3:6.0.1-1
    • 3:6.0.2-1
    • 3:6.0.3-1
    • 3:6.0.4-1
    • 3:6.0.5-1
    • 3:6.0.6-1
    • 3:6.0~alpha1-1
    • 3:6.0~beta1-1
    • 3:6.0~rc1-1
    • 3:6.1-1
    • 3:6.1.1-1
    • 3:6.1~beta1-1
    • 3:6.1~rc1-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Debian:14

    Versions
    • 3:4.2.23-1
    • 3:4.2.24-1
    • 3:4.2.25-1
    • 3:4.2.25-2
    • 3:4.2.26-1
    • 3:4.2.27-1
    • 3:4.2.27-2
    • 3:4.2.28-1
    • 3:4.2.29-1
    • 3:4.2.30-1
    • 3:5.0-1
    • 3:5.0.1-1
    • 3:5.0.2-1
    • 3:5.0.3-1
    • 3:5.0.4-1
    • 3:5.0.6-1
    • 3:5.0~alpha1-1
    • 3:5.0~rc1-1
    • 3:5.1-1
    • 3:5.1.1-1
    • 3:5.1.2-1
    • 3:5.1.3-1
    • 3:5.1.4-1
    • 3:5.1.5-1
    • 3:5.1~alpha1-1
    • 3:5.1~beta1-1
    • 3:5.1~rc1-1
    • 3:5.2-1
    • 3:5.2.1-1
    • 3:5.2.13-1
    • 3:5.2.14-1
    • 3:5.2.14-2
    • 3:5.2.2-1
    • 3:5.2.3-1
    • 3:5.2.4-1
    • 3:5.2.5-1
    • 3:5.2.6-1
    • 3:5.2~alpha1-1
    • 3:5.2~beta1-1
    • 3:5.2~rc1-1
    Affected ranges
    • ECOSYSTEM: < 3:5.2.15-1

    Update to 3:5.2.15-1

  • django PyPI

    Versions
    • 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
    Affected ranges
    • ECOSYSTEM: ≥ 5.2, < 5.2.15

    Update to 5.2.15

  • django PyPI

    Versions
    • 6.0
    • 6.0.1
    • 6.0.2
    • 6.0.3
    • 6.0.4
    • 6.0.5
    Affected ranges
    • ECOSYSTEM: ≥ 6.0, < 6.0.6

    Update to 6.0.6

  • django PyPI

    Versions
    • 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
    • 6.0
    • 6.0.1
    • 6.0.2
    • 6.0.3
    • 6.0.4
    • 6.0.5
    Affected ranges
    • ECOSYSTEM: ≥ 5.2, < 5.2.15 ∪ ≥ 6.0, < 6.0.6

    Update to 5.2.15; Update to 6.0.6

  • python-django Ubuntu:Pro:14.04:LTS

    Versions
    • 1.5.4-1ubuntu1
    • 1.6-1
    • 1.6.1-1
    • 1.6.1-2
    • 1.6.1-2ubuntu0.1
    • 1.6.1-2ubuntu0.2
    • 1.6.1-2ubuntu0.3
    • 1.6.1-2ubuntu0.4
    • 1.6.1-2ubuntu0.5
    • 1.6.1-2ubuntu0.6
    • 1.6.1-2ubuntu0.8
    • 1.6.1-2ubuntu0.9
    • 1.6.1-2ubuntu0.10
    • 1.6.1-2ubuntu0.11
    • 1.6.1-2ubuntu0.12
    • 1.6.1-2ubuntu0.13
    • 1.6.1-2ubuntu0.14
    • 1.6.1-2ubuntu0.15
    • 1.6.1-2ubuntu0.16
    • 1.6.11-0ubuntu1
    • 1.6.11-0ubuntu1.1
    • 1.6.11-0ubuntu1.2
    • 1.6.11-0ubuntu1.3
    • 1.6.11-0ubuntu1.3+esm1
    • 1.6.11-0ubuntu1.3+esm2
    • 1.6.11-0ubuntu1.3+esm3
    • 1.6.11-0ubuntu1.3+esm4
    • 1.6.11-0ubuntu1.3+esm5
    • 1.6.11-0ubuntu1.3+esm6
    • 1.6.11-0ubuntu1.3+esm7
    • 1.6.11-0ubuntu1.3+esm8
    • 1.6.11-0ubuntu1.3+esm9
    • 1.6.11-0ubuntu1.3+esm10
    • 1.6.11-0ubuntu1.3+esm11
    • 1.6.11-0ubuntu1.3+esm12
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:16.04:LTS

    Versions
    • 1.7.9-1ubuntu5
    • 1.8.5-2ubuntu1
    • 1.8.7-1ubuntu1
    • 1.8.7-1ubuntu2
    • 1.8.7-1ubuntu3
    • 1.8.7-1ubuntu4
    • 1.8.7-1ubuntu5
    • 1.8.7-1ubuntu5.1
    • 1.8.7-1ubuntu5.2
    • 1.8.7-1ubuntu5.4
    • 1.8.7-1ubuntu5.5
    • 1.8.7-1ubuntu5.6
    • 1.8.7-1ubuntu5.7
    • 1.8.7-1ubuntu5.8
    • 1.8.7-1ubuntu5.9
    • 1.8.7-1ubuntu5.10
    • 1.8.7-1ubuntu5.11
    • 1.8.7-1ubuntu5.12
    • 1.8.7-1ubuntu5.13
    • 1.8.7-1ubuntu5.14
    • 1.8.7-1ubuntu5.15
    • 1.8.7-1ubuntu5.15+esm1
    • 1.8.7-1ubuntu5.15+esm3
    • 1.8.7-1ubuntu5.15+esm4
    • 1.8.7-1ubuntu5.15+esm5
    • 1.8.7-1ubuntu5.15+esm6
    • 1.8.7-1ubuntu5.15+esm7
    • 1.8.7-1ubuntu5.15+esm8
    • 1.8.7-1ubuntu5.15+esm9
    • 1.8.7-1ubuntu5.15+esm10
    • 1.8.7-1ubuntu5.15+esm11
    • 1.8.7-1ubuntu5.15+esm12
    • 1.8.7-1ubuntu5.15+esm13
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:18.04:LTS

    Versions
    • 1:1.11.4-1ubuntu1
    • 1:1.11.6-1ubuntu1
    • 1:1.11.9-1ubuntu1
    • 1:1.11.11-1ubuntu1
    • 1:1.11.11-1ubuntu1.1
    • 1:1.11.11-1ubuntu1.2
    • 1:1.11.11-1ubuntu1.3
    • 1:1.11.11-1ubuntu1.4
    • 1:1.11.11-1ubuntu1.5
    • 1:1.11.11-1ubuntu1.6
    • 1:1.11.11-1ubuntu1.7
    • 1:1.11.11-1ubuntu1.8
    • 1:1.11.11-1ubuntu1.9
    • 1:1.11.11-1ubuntu1.10
    • 1:1.11.11-1ubuntu1.11
    • 1:1.11.11-1ubuntu1.12
    • 1:1.11.11-1ubuntu1.13
    • 1:1.11.11-1ubuntu1.14
    • 1:1.11.11-1ubuntu1.15
    • 1:1.11.11-1ubuntu1.16
    • 1:1.11.11-1ubuntu1.17
    • 1:1.11.11-1ubuntu1.18
    • 1:1.11.11-1ubuntu1.19
    • 1:1.11.11-1ubuntu1.20
    • 1:1.11.11-1ubuntu1.21
    • 1:1.11.11-1ubuntu1.21+esm1
    • 1:1.11.11-1ubuntu1.21+esm2
    • 1:1.11.11-1ubuntu1.21+esm3
    • 1:1.11.11-1ubuntu1.21+esm4
    • 1:1.11.11-1ubuntu1.21+esm5
    • 1:1.11.11-1ubuntu1.21+esm6
    • 1:1.11.11-1ubuntu1.21+esm7
    • 1:1.11.11-1ubuntu1.21+esm8
    • 1:1.11.11-1ubuntu1.21+esm9
    • 1:1.11.11-1ubuntu1.21+esm10
    • 1:1.11.11-1ubuntu1.21+esm11
    • 1:1.11.11-1ubuntu1.21+esm12
    • 1:1.11.11-1ubuntu1.21+esm13
    • 1:1.11.11-1ubuntu1.21+esm14
    • 1:1.11.11-1ubuntu1.21+esm15
    • 1:1.11.11-1ubuntu1.21+esm17
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:Pro:20.04:LTS

    Versions
    • 1:1.11.22-1ubuntu1
    • 2:2.2.6-1ubuntu1
    • 2:2.2.9-2ubuntu1
    • 2:2.2.10-1
    • 2:2.2.10-1ubuntu1
    • 2:2.2.11-1
    • 2:2.2.12-1
    • 2:2.2.12-1ubuntu0.1
    • 2:2.2.12-1ubuntu0.2
    • 2:2.2.12-1ubuntu0.3
    • 2:2.2.12-1ubuntu0.4
    • 2:2.2.12-1ubuntu0.5
    • 2:2.2.12-1ubuntu0.6
    • 2:2.2.12-1ubuntu0.7
    • 2:2.2.12-1ubuntu0.8
    • 2:2.2.12-1ubuntu0.9
    • 2:2.2.12-1ubuntu0.10
    • 2:2.2.12-1ubuntu0.11
    • 2:2.2.12-1ubuntu0.12
    • 2:2.2.12-1ubuntu0.13
    • 2:2.2.12-1ubuntu0.14
    • 2:2.2.12-1ubuntu0.15
    • 2:2.2.12-1ubuntu0.16
    • 2:2.2.12-1ubuntu0.17
    • 2:2.2.12-1ubuntu0.18
    • 2:2.2.12-1ubuntu0.19
    • 2:2.2.12-1ubuntu0.20
    • 2:2.2.12-1ubuntu0.21
    • 2:2.2.12-1ubuntu0.22
    • 2:2.2.12-1ubuntu0.23
    • 2:2.2.12-1ubuntu0.24
    • 2:2.2.12-1ubuntu0.25
    • 2:2.2.12-1ubuntu0.26
    • 2:2.2.12-1ubuntu0.27
    • 2:2.2.12-1ubuntu0.28
    • 2:2.2.12-1ubuntu0.29
    • 2:2.2.12-1ubuntu0.29+esm1
    • 2:2.2.12-1ubuntu0.29+esm2
    • 2:2.2.12-1ubuntu0.29+esm3
    • 2:2.2.12-1ubuntu0.29+esm4
    • 2:2.2.12-1ubuntu0.29+esm5
    • 2:2.2.12-1ubuntu0.29+esm6
    • 2:2.2.12-1ubuntu0.29+esm7
    • 2:2.2.12-1ubuntu0.29+esm8
    • 2:2.2.12-1ubuntu0.29+esm10
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:22.04:LTS

    Versions
    • 2:2.2.24-1ubuntu1
    • 2:3.2.12-2
    • 2:3.2.12-2ubuntu1
    • 2:3.2.12-2ubuntu1.1
    • 2:3.2.12-2ubuntu1.2
    • 2:3.2.12-2ubuntu1.3
    • 2:3.2.12-2ubuntu1.4
    • 2:3.2.12-2ubuntu1.5
    • 2:3.2.12-2ubuntu1.6
    • 2:3.2.12-2ubuntu1.7
    • 2:3.2.12-2ubuntu1.8
    • 2:3.2.12-2ubuntu1.9
    • 2:3.2.12-2ubuntu1.10
    • 2:3.2.12-2ubuntu1.11
    • 2:3.2.12-2ubuntu1.12
    • 2:3.2.12-2ubuntu1.13
    • 2:3.2.12-2ubuntu1.14
    • 2:3.2.12-2ubuntu1.15
    • 2:3.2.12-2ubuntu1.16
    • 2:3.2.12-2ubuntu1.17
    • 2:3.2.12-2ubuntu1.18
    • 2:3.2.12-2ubuntu1.19
    • 2:3.2.12-2ubuntu1.20
    • 2:3.2.12-2ubuntu1.21
    • 2:3.2.12-2ubuntu1.22
    • 2:3.2.12-2ubuntu1.23
    • 2:3.2.12-2ubuntu1.24
    • 2:3.2.12-2ubuntu1.25
    • 2:3.2.12-2ubuntu1.26
    • 2:3.2.12-2ubuntu1.27
    • 2:3.2.12-2ubuntu1.29
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:24.04:LTS

    Versions
    • 3:4.2.4-1ubuntu2
    • 3:4.2.8-1
    • 3:4.2.9-1
    • 3:4.2.11-1
    • 3:4.2.11-1ubuntu1
    • 3:4.2.11-1ubuntu1.1
    • 3:4.2.11-1ubuntu1.2
    • 3:4.2.11-1ubuntu1.3
    • 3:4.2.11-1ubuntu1.4
    • 3:4.2.11-1ubuntu1.5
    • 3:4.2.11-1ubuntu1.6
    • 3:4.2.11-1ubuntu1.7
    • 3:4.2.11-1ubuntu1.8
    • 3:4.2.11-1ubuntu1.9
    • 3:4.2.11-1ubuntu1.10
    • 3:4.2.11-1ubuntu1.11
    • 3:4.2.11-1ubuntu1.12
    • 3:4.2.11-1ubuntu1.13
    • 3:4.2.11-1ubuntu1.14
    • 3:4.2.11-1ubuntu1.15
    • 3:4.2.11-1ubuntu1.16
    • 3:4.2.11-1ubuntu1.18
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:25.10

    Versions
    • 3:4.2.18-1ubuntu1
    • 3:4.2.18-1ubuntu1.1
    • 3:5.2.4-1
    • 3:5.2.4-1ubuntu1
    • 3:5.2.4-1ubuntu2
    • 3:5.2.4-1ubuntu2.1
    • 3:5.2.4-1ubuntu2.2
    • 3:5.2.4-1ubuntu2.3
    • 3:5.2.4-1ubuntu2.4
    • 3:5.2.4-1ubuntu2.5
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:26.10

    Versions
    • 3:5.2.9-0ubuntu4
    • 3:5.2.16-1
    • 3:5.2.17-1
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

  • python-django Ubuntu:26.04:LTS

    Versions
    • 3:5.2.4-1ubuntu2
    • 3:5.2.4-1ubuntu3
    • 3:5.2.9-0ubuntu1
    • 3:5.2.9-0ubuntu2
    • 3:5.2.9-0ubuntu3
    • 3:5.2.9-0ubuntu4
    • 3:5.2.9-0ubuntu4.1
    • 3:5.2.9-0ubuntu4.3
    Affected ranges
    • ECOSYSTEM: (−∞, +∞)

    No fix published

Original sources

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