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

Quick assessment

Affected
djangoproject Django
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 3.1 · Low EPSS 0.21% · P9

Affected Version Matrix 4

VendorProduct Version RangeStatus
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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
敏感数据的明文传输
Source: CVE Program / CVE List V5
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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III. Intelligence Information for CVE-2026-7666

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Vendor Advisories for CVE-2026-7666 (1)

Mailing List Discussions for CVE-2026-7666 (1)

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
Same vendor: djangoproject
Same weakness: CWE-319

V. Comments for CVE-2026-7666

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