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RUSTSEC-2026-0141
No affected components available
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 certificate
for any domain can intercept SMTP submission, including PLAIN/LOGIN
credentials and message contents, against any lettre user built with the
boring-tls feature. Other TLS backends (native-tls, rustls) are
unaffected.
The bug was introduced in v0.10.1 and persists through v0.11.21 (latest).
The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability.
Exploitation attempts have been detected. Elevated vigilance and prompt remediation are advised.
The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.
We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.
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