CVE-2026-46428
- Source
- https://cve.org/CVERecord?id=CVE-2026-46428
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-46428.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2026-46428
- Aliases
- Published
- 2026-07-20T15:37:58Z
- Modified
- 2026-10-28T02:30:23Z
- Severity
-
- 9.1 (Critical) CVSS_V4 - 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 Calculator
- Summary
- lettre has TLS hostname verification disabled when using Boring TLS backend
- Details
-
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-tlsintegration 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 theboring-tlsfeature. Other TLS backends (native-tls,rustls) are unaffected. Version 0.11.22 patches the issue. - Database specific
{ "cna_assigner": "GitHub_M", "cwe_ids": [ "CWE-295" ], "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46428.json" }- References
-
- https://github.com/lettre/lettre/releases/tag/v0.11.22
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/46xxx/CVE-2026-46428.json
- https://github.com/lettre/lettre/security/advisories/GHSA-4pj9-g833-qx53
- https://nvd.nist.gov/vuln/detail/CVE-2026-46428
- https://rustsec.org/advisories/RUSTSEC-2026-0141.html
- https://github.com/lettre/lettre/commit/f5efffc88360dbdbfcef80f465e42d5bce68ca35
Affected packages
Git / github.com/lettre/lettre
Affected ranges
- Type
- GIT
- Repo
- https://github.com/lettre/lettre
- Events
- Database specific
-
Show details
{ "extracted_events": [ { "range": [ { "introduced": "0.10.1" }, { "fixed": "0.11.22" } ], "source": "AFFECTED_FIELD", "strategy": "StringRangeExpression" }, { "range": [ { "fixed": "f5efffc88360dbdbfcef80f465e42d5bce68ca35" } ], "source": "REFERENCES_COMMIT" }, { "original_tag": "v0.11.22", "range": [ { "fixed": "9b88c4ff98fd8653cb389a66f885f02efd79ee6b" } ], "source": "REFERENCES_TAG" } ] }