CVE-2026-55558 | cole aiosmtplib up to 5.1.1 protocol.py SMTPProtocol.start_tls missing encryption

August 20, 2026 Yanac

A vulnerability was found in cole aiosmtplib up to 5.1.1. It has been classified as problematic. Affected is the function SMTPProtocol.start_tls of the file src/aiosmtplib/protocol.py. The manipulation leads to missing encryption of sensitive data.

This vulnerability is referenced as CVE-2026-55558. Remote exploitation of the attack is possible. No exploit is available.

Upgrading the affected component is recommended.VulDB Recent EntriesRead More