CVE-2026-7666— Potential unencrypted email transmission via STARTTLS in the SMTP backend
Affected Version Matrix 4
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| djangoproject | Django | 6.0< 6.0.6 | affected |
6.0.6 | unaffected | ||
5.2< 5.2.15 | affected | ||
5.2.15 | unaffected |
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I. Basic Information for CVE-2026-7666
Vulnerability Information
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Vulnerability Title
Potential unencrypted email transmission via STARTTLS in the SMTP backend
Source: NVD (National Vulnerability Database)
Vulnerability 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: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
敏感数据的明文传输
Source: NVD (National Vulnerability Database)
Vulnerability Title
Django 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Django是Django基金会的一套基于Python语言的开源Web应用框架。该框架包括面向对象的映射器、视图系统、模板系统等。 Django 6.0.6之前版本和5.2.15之前版本存在安全漏洞，该漏洞源于EmailBackend在STARTTLS握手失败后未阻止重用部分初始化的连接，可能导致邮件内容被明文拦截。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| djangoproject | Django | 6.0 ~ 6.0.6 | - |
II. Public POCs for CVE-2026-7666
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|---|
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Vendor Advisories for CVE-2026-7666 (1)
- Archive of security issues | Django documentation | Djangovendor-advisory
Mailing List Discussions for CVE-2026-7666 (1)
- django-announce - Google Groupsmailing-list
Security Blog Posts for CVE-2026-7666 (1)
Same Patch Batch · djangoproject · 2026-06-03 · 7 CVEs total
| CVE-2026-44545 | 5.3 MEDIUM | Unbounded WebSocket message and frame sizes can cause unauthenticated remote denial of ser |
| CVE-2026-44546 | 3.7 LOW | Header injection via WebSocket upgrade parser differential allows ASGI scope header spoofi |
| CVE-2026-48587 | 3.1 LOW | Potential exposure of private data via whitespace padding in Vary header |
| CVE-2026-35193 | 3.1 LOW | Potential exposure of private data via missing Vary: Authorization in UpdateCacheMiddlewar |
| CVE-2026-6873 | 3.1 LOW | Signed cookie salt namespace collision in django.http.HttpRequest.get_signed_cookie |
| CVE-2026-8404 | 3.1 LOW | Potential exposure of private data via case-sensitive Cache-Control directives in UpdateCa |
IV. Related Vulnerabilities
Same product: Django
- CVE-2026-48587
Potential exposure of private data via whitespace padding in - CVE-2026-35193
Potential exposure of private data via missing Vary: Authori - CVE-2026-8404
Potential exposure of private data via case-sensitive Cache- - CVE-2026-6873
Signed cookie salt namespace collision in django.http.HttpRe - CVE-2026-35192
Session fixation via public cached pages and SESSION_SAVE_EV
Same vendor: djangoproject
- CVE-2026-44546
Header injection via WebSocket upgrade parser differential a - CVE-2026-44545
Unbounded WebSocket message and frame sizes can cause unauth - CVE-2026-48587
Potential exposure of private data via whitespace padding in - CVE-2026-35193
Potential exposure of private data via missing Vary: Authori - CVE-2026-8404
Potential exposure of private data via case-sensitive Cache-
Same weakness: CWE-319
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V. Comments for CVE-2026-7666
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