CVE-2026-46428

A flaw was found in lettre, a mailer library for Rust. An inverted-boolean bug in the boring-tls integration silently disables TLS hostname verification for users employing the default strict configuration. A remote on-path attacker can exploit this by presenting any valid TLS certificate, allowi...

CVE-2026-46428

lettre is a a mailer library for Rust. Starting in version 0.10.1 and prior to version 0.11.22, an inverted-boolean bug in lettre's boring-tls integration silently disables TLS hostname verification for callers using the default strict configuration. An on-path attacker presenting any chain-valid...

CVE-2026-46428 lettre has TLS hostname verification disabled when using Boring TLS backend

lettre is a a mailer library for Rust. Starting in version 0.10.1 and prior to version 0.11.22, an inverted-boolean bug in lettre's boring-tls integration silently disables TLS hostname verification for callers using the default strict configuration. An on-path attacker presenting any chain-valid...