{"id":59492,"date":"2026-06-03T09:53:13","date_gmt":"2026-06-03T09:53:13","guid":{"rendered":"https:\/\/zero.redgem.net\/?p=59492"},"modified":"2026-06-03T09:53:13","modified_gmt":"2026-06-03T09:53:13","slug":"potential-unencrypted-email-transmission-via-starttls-in-the-smtp-backend","status":"publish","type":"post","link":"https:\/\/zero.redgem.net\/?p=59492","title":{"rendered":"Potential unencrypted email transmission via STARTTLS in the SMTP backend_CVE-2026-7666"},"content":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15.\\n`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.\\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\\nDjango would like to thank Kasper Dupont for reporting this issue.&#8221;,&#8221;published&#8221;:&#8221;2026-06-03T13:16:15.446Z&#8221;,&#8221;modified&#8221;:&#8221;2026-06-03T13:16:15.446Z&#8221;,&#8221;type&#8221;:&#8221;cve&#8221;,&#8221;title&#8221;:&#8221;Potential unencrypted email transmission via STARTTLS in the SMTP backend&#8221;,&#8221;source&#8221;:&#8221;DSF&#8221;,&#8221;references&#8221;:&#8221;https:\/\/docs.djangoproject.com\/en\/dev\/releases\/security\/\\nhttps:\/\/groups.google.com\/g\/django-announce\\nhttps:\/\/www.djangoproject.com\/weblog\/2026\/jun\/03\/security-releases\/&#8221;,&#8221;id&#8221;:&#8221;CVE-2026-7666&#8243;,&#8221;bulletinFamily&#8221;:&#8221;&#8221;,&#8221;cwe&#8221;:[&#8220;CWE-319&#8243;],&#8221;cvelist&#8221;:null,&#8221;sourceData&#8221;:&#8221;djangoproject Django 6.0\\ndjangoproject Django 5.2&#8243;,&#8221;sourceHref&#8221;:&#8221;&#8221;,&#8221;cvss&#8221;:{&#8220;score&#8221;:3.1,&#8221;severity&#8221;:&#8221;LOW&#8221;,&#8221;vector&#8221;:&#8221;CVSS:3.1\/AV:N\/AC:H\/PR:N\/UI:R\/S:U\/C:L\/I:N\/A:N&#8221;,&#8221;version&#8221;:&#8221;3.1&#8243;},&#8221;cvss2&#8243;:{},&#8221;cvss3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;,&#8221;cvssV3&#8243;:{&#8220;version&#8221;:&#8221;&#8221;,&#8221;vectorString&#8221;:&#8221;&#8221;,&#8221;baseScore&#8221;:0,&#8221;baseSeverity&#8221;:&#8221;&#8221;,&#8221;attackVector&#8221;:&#8221;&#8221;,&#8221;attackComplexity&#8221;:&#8221;&#8221;,&#8221;privilegesRequired&#8221;:&#8221;&#8221;,&#8221;userInteraction&#8221;:&#8221;&#8221;,&#8221;scope&#8221;:&#8221;&#8221;,&#8221;confidentialityImpact&#8221;:&#8221;&#8221;,&#8221;integrityImpact&#8221;:&#8221;&#8221;,&#8221;availabilityImpact&#8221;:&#8221;&#8221;}},&#8221;href&#8221;:&#8221;&#8221;,&#8221;category_name&#8221;:&#8221;CVE&#8221;,&#8221;post_link&#8221;:&#8221;&#8221;,&#8221;product&#8221;:&#8221;Django&#8221;,&#8221;version&#8221;:&#8221;6.0&#8243;,&#8221;vendor&#8221;:&#8221;djangoproject&#8221;,&#8221;ai_description&#8221;:&#8221;&#8221;,&#8221;ai_severity&#8221;:&#8221;&#8221;,&#8221;ai_vendor&#8221;:&#8221;&#8221;,&#8221;ai_product&#8221;:&#8221;&#8221;,&#8221;ai_version&#8221;:&#8221;&#8221;,&#8221;ai_score&#8221;:0}<\/p>\n","protected":false},"excerpt":{"rendered":"<p>{&#8220;lastseen&#8221;:&#8221;&#8221;,&#8221;description&#8221;:&#8221;An issue was discovered in Django 6.0 before 6.0.6 and 5.2 before 5.2.15.\\n`django.core.mail.backends.smtp.EmailBackend` in Django fails to prevent reuse of a partially-initialized connection after a&#8230;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[6,8,133,12,71,13,7,11,5],"class_list":["post-59492","post","type-post","status-publish","format-standard","hentry","category-category_cve","tag-cve","tag-cvss","tag-cvss-31","tag-exploit","tag-low","tag-news","tag-security","tag-tapic","tag-vulnerability"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.5 - 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