{"id":"CVE-2026-46428","revision":"3580568f40ba4fadbaa9b2cc34844858","records":[{"revision":"3580568f40ba4fadbaa9b2cc34844858","observedAt":"2026-10-25T12:17:14.897+00:00","statement":{"source":"nvd","id":"CVE-2026-46428","aliases":[],"title":"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) …","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.","state":0,"publishedAt":"2026-07-20T16:17:01.347+00:00","modifiedAt":"2026-07-23T17:58:34.99+00:00","affected":[],"metrics":[{"system":"CVSS 4.0 · security-advisories@github.com · Secondary","vector":"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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","score":9.1,"severity":"CRITICAL"}],"references":["https://github.com/lettre/lettre/commit/f5efffc88360dbdbfcef80f465e42d5bce68ca35","https://github.com/lettre/lettre/releases/tag/v0.11.22","https://github.com/lettre/lettre/security/advisories/GHSA-4pj9-g833-qx53","https://rustsec.org/advisories/RUSTSEC-2026-0141.html"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-46428","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Deferred","weaknesses":["CWE-295"],"productCriteria":[],"sourceDates":{"published":"2026-07-20T16:17:01.347","lastModified":"2026-07-23T17:58:34.990"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-46428","identifiers":["CVE-2026-46428"]},"retained":false,"historicalAffected":[]}],"coverage":[]}