TI-2026-06748 Aliases CVE-2026-7666 GHSA-mm6v-q8q9-pgcf

Potential unencrypted email transmission via STARTTLS in the SMTP backend

LOW 11CWE-319Published 2026-06-03 · Updated 2026-06-03

Key facts

Attack vector: Network
Privileges required: None
User interaction: Passive
Attack complexity: High
Attack requirements: Present
Impact type: Information disclosure
Confidentiality · integrity · availability: Low · None · None
Fix status: Partial Red Hat: 3 without a fix

Attack profile from CVSS 4.0 · CNA. Fix status from CNA, GitHub and Red Hat. Impact type from CWE-319.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.0015 4th percentileScored 2026-11-07

Fix Partial Django (djangoproject): 6.0.6, 5.2.15django (PyPI): 5.2.15, 6.0.6Red Hat: 3 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
djangoproject	Django	6.0 to before 6.0.6; 5.2 to before 5.2.15	6.0.6, 5.2.15	Patch available	CNA
—	django (PyPI)	5.2 to before 5.2.15	5.2.15	Patch available	GHSA-mm6v-q8q9-pgcf
—	django (PyPI)	6.0 to before 6.0.6	6.0.6	Patch available	GHSA-mm6v-q8q9-pgcf

Django Vendordjangoproject Affected 6.0 to before 6.0.6; 5.2 to before 5.2.15 Fixed in 6.0.6, 5.2.15 Patch available CNA
django (PyPI) Vendor— Affected 5.2 to before 5.2.15 Fixed in 5.2.15 Patch available GHSA-mm6v-q8q9-pgcf
django (PyPI) Vendor— Affected 6.0 to before 6.0.6 Fixed in 6.0.6 Patch available GHSA-mm6v-q8q9-pgcf

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:djangoproject:django::::::::	5.2 to before 5.2.15; 6.0 to before 6.0.6	Vulnerable	djangoproject

cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:* Versions 5.2 to before 5.2.15; 6.0 to before 6.0.6 Vulnerable ·djangoproject

Remediation

Fix · CNA Django (djangoproject) Fixed in 6.0.6, 5.2.15
Fix · GHSA-mm6v-q8q9-pgcf django (PyPI) Fixed in 5.2.15 Advisory →
Fix · GHSA-mm6v-q8q9-pgcf django (PyPI) Fixed in 6.0.6 Advisory →

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Advisory · 2026-06-03
djangoproject Django — Django security releases issued: 6.0.6 and 5.2.15
5 records Highest priority Priority LOW 5 LOW
Other records, highest priority first
- TI-2026-35943 Potential exposure of private data via whitespace padding in Vary headerPriority LOW 12
- TI-2026-27346 Potential exposure of private data via missing Vary: Authorization in UpdateCacheMiddlewarePriority LOW 12
- TI-2026-07386 Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCacheMiddlewarePriority LOW 12
Show all 5 records → Advisory →

Vendor assessments

Red Hat

Red Hat rating: Low. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Ansible Automation Platform 2	Affected	No fix yet: Fix deferred
Red Hat Discovery 2	Affected	No fix yet: Fix deferred
Red Hat Satellite 6	Affected	No fix yet: Fix deferred

Timeline

2026-10-02 Threatist record created from CVE-2026-7666
2026-10-03 Alias added: GHSA-mm6v-q8q9-pgcf

References

Patch 2

Advisory 1

https://nvd.nist.gov/vuln/detail/CVE-2026-7666

Other 5

TI-2022-15177 An issue was discovered in Django 3.2 before 3.2.14 and 4.0 before 4.0.6. CVSS 3.1CRITICAL 9.8
TI-2020-05994 Django 1.11 before 1.11.28, 2.2 before 2.2.10, and 3.0 before 3.0.3 allows SQL Injection… CVSS 3.1CRITICAL 9.8
TI-2023-10198 An issue was discovered in the Multipart Request Parser in Django 3.2 before 3.2.18, 4.0… CVSS 3.1HIGH 7.5
TI-2019-14306 Django before 1.11.27, 2.x before 2.2.9, and 3.x before 3.0.1 allows account takeover. CVSS 3.1CRITICAL 9.8
TI-2019-10595 An issue was discovered in Django 1.11.x before 1.11.23, 2.1.x before 2.1.11, and 2.2.x… CVSS 3.0CRITICAL 9.8
TI-2021-14006 Django 3.1.x before 3.1.13 and 3.2.x before 3.2.5 allows QuerySet.order_by SQL injection… CVSS 3.1CRITICAL 9.8

See all 156 →

Sources

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