CVE-2026-46428
Essential information
- Published
- 20/07/2026 18:17
- Modified
- —
- Author
- The MITRE Corporation
- Creator
- The MITRE Corporation
- CVSS
- 9.1 CRITICAL (v4.0)
- CISA KEV
- No
- CWE
- CWE-295
- CVSS vector
-
—
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CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N
CVSS metrics
- Access vector
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- Access complexity
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- Authentication
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- Confidentiality impact
- —
- Integrity impact
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- Availability impact
- —
- Exploitability
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- Remediation level
- —
- Report confidence
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- Temporal score
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- Attack vector
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- Attack complexity
- —
- Privileges required
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- User interaction
- —
- Scope
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- Confidentiality impact
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- Integrity impact
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- Availability impact
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- Exploit code maturity
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- Remediation level
- —
- Report confidence
- —
- Temporal score
- —
- Attack vector
- NETWORK
- Attack complexity
- LOW
- Attack requirements
- PRESENT
- Privileges required
- NONE
- User interaction
- NONE
- Confidentiality (V)
- HIGH
- Confidentiality (S)
- LOW
- Integrity (V)
- HIGH
- Integrity (S)
- LOW
- Availability (V)
- NONE
- Availability (S)
- NONE
- Exploit maturity
- —
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.
NVD status
- NVD
- View on NVD