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GHSA-9J88-VVJ5-VHGR MailKit has STARTTLS Response Injection via unflushed stream buffer that enables SASL mechanism downgrade

🗓️ 18 Apr 2026 01:13:46Reported by GoogleType 
osv
 osv
🔗 osv.dev👁 10 Views

MailKit STARTTLS upgrade injection enables a man-in-the-middle to downgrade authentication and inject pre-TLS data by not flushing the read buffer in smtp, imap, and pop3

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05 May 2026 16:05Current
5.9Medium risk
Vulners AI Score5.9
CVSS 3.16.5
EPSS0.00223
10