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    6 vulnerabilities by lettre

    CVE-2026-46428 (GCVE-0-2026-46428)

    Vulnerability from nvd – Published: 2026-07-20 15:37 – Updated: 2026-07-21 15:49
    VLAI
    Title
    lettre has TLS hostname verification disabled when using Boring TLS backend
    Summary
    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.
    Severity
    9.1 (Critical)
    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
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-295 - Improper Certificate Validation
    Assigner
    References
    Impacted products
    Vendor Product Version
    lettre lettre Affected: >= 0.10.1, < 0.11.22
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2021-38189 (GCVE-0-2021-38189)

    Vulnerability from nvd – Published: 2021-08-08 05:10 – Updated: 2024-08-04 01:37
    VLAI
    Summary
    An issue was discovered in the lettre crate before 0.9.6 for Rust. In an e-mail message body, an attacker can place a . character after two <CR><LF> sequences and then inject arbitrary SMTP commands.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Show details on NVD website
    To clipboard 

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    CVE-2020-28247 (GCVE-0-2020-28247)

    Vulnerability from nvd – Published: 2020-11-12 18:03 – Updated: 2024-08-04 16:33
    VLAI
    Summary
    The lettre library through 0.10.0-alpha for Rust allows arbitrary sendmail option injection via transport/sendmail/mod.rs.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Show details on NVD website
    To clipboard 

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    CVE-2026-46428 (GCVE-0-2026-46428)

    Vulnerability from cvelistv5 – Published: 2026-07-20 15:37 – Updated: 2026-07-21 15:49
    VLAI
    Title
    lettre has TLS hostname verification disabled when using Boring TLS backend
    Summary
    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.
    Severity
    9.1 (Critical)
    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
    SSVC
    Exploitation: poc Automatable: no Technical Impact: total
    CISA Coordinator (v2.0.3)
    CWE
    • CWE-295 - Improper Certificate Validation
    Assigner
    References
    Impacted products
    Vendor Product Version
    lettre lettre Affected: >= 0.10.1, < 0.11.22
    		Create a notification for this product.
    Show details on NVD website
    To clipboard 

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    CVE-2021-38189 (GCVE-0-2021-38189)

    Vulnerability from cvelistv5 – Published: 2021-08-08 05:10 – Updated: 2024-08-04 01:37
    VLAI
    Summary
    An issue was discovered in the lettre crate before 0.9.6 for Rust. In an e-mail message body, an attacker can place a . character after two <CR><LF> sequences and then inject arbitrary SMTP commands.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Show details on NVD website
    To clipboard 

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    CVE-2020-28247 (GCVE-0-2020-28247)

    Vulnerability from cvelistv5 – Published: 2020-11-12 18:03 – Updated: 2024-08-04 16:33
    VLAI
    Summary
    The lettre library through 0.10.0-alpha for Rust allows arbitrary sendmail option injection via transport/sendmail/mod.rs.
    Severity
    No CVSS data available.
    CWE
    • n/a
    Assigner
    References
    Show details on NVD website
    To clipboard 

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