Threats Tagged 'ubuntu-cve-2026-55558'
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Threats Tagged 'ubuntu-cve-2026-55558'
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CVE-2026-55558 is a vulnerability in aiosmtplib affecting versions prior to 5.1.2 when using STARTTLS. The issue arises because data buffered after the server's 220 go-ahead reply and before the TLS handshake is not discarded, allowing an active man-in-the-middle attacker to inject malicious response lines that are parsed as part of the encrypted session, causing desynchronization of command/response pairs. Implicit TLS connections (use_tls=True) are not affected. A fix is available in version 5.1.2. Join the discussion | CVE Database V5 | 08/27/2026, 23:32:22 UTC Added: 08/20/2026, 14:38:09 UTC |
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