CVE-2026-46428Disclosure

LOWCVSS 9.1 · CRITICAL

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

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 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. Version 0.11.22 patches the issue.

Back to dashboard

0.0/ 10 priority

Sources & remediation

Other references

Weakness type (CWE)

CWE-295

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://www.cve.org/CVERecord?id=CVE-2026-46428

Full discourse1 post

CVE@CVEnew91d
Disclosure
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 … https://www.cve.org/CVERecord?id=CVE-2026-46428
Post summary
CVE-2026-46428 refers to an inverted-boolean bug in the Lettre mailer library’s `boring-tls` integration for Rust, affecting versions 0.10.1 through 0.11.21, with no mention of exploitation, patch, or PoC.
01000752
57.8K followersView on X

Explore more

Back to dashboard