{"schema_version":1,"title":"lettre (crates.io) vulnerabilities","summary":"Junglewise Threat Intelligence has tracked 3 vulnerabilities in lettre (crates.io): 0 in the last 7 days and 1 in the last 90 days, 1 of them critical and 0 exploited in the wild. The most recent, CVE-2026-46428, was published on 20 July 2026.","url":"https://junglewise.ai/threats/technologies/crates-io-lettre","json_url":"https://junglewise.ai/threats/technologies/crates-io-lettre.json","publisher":"Junglewise Threat Intelligence","license":"CC-BY-4.0","license_url":"https://creativecommons.org/licenses/by/4.0/","attribution":"Junglewise Threat Intelligence, https://junglewise.ai/threats/technologies/crates-io-lettre","sources":"NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories","kind":"technology","counts":{"high":0,"all_time":3,"critical":1,"exploited":0,"last_7_days":0,"last_30_days":0,"last_90_days":1,"last_365_days":1},"latest":[{"cve":"CVE-2026-46428","cvss":4,"epss":0.0032,"slug":"cve-2026-46428-lettre-tls-hostname-verification-bypass-in-boring-tls-backend","title":"lettre TLS hostname verification bypass in boring-tls backend","severity":"critical","exploited":false,"published_at":"2026-07-20T16:17:01.347+00:00","url":"https://junglewise.ai/threats/cve-2026-46428-lettre-tls-hostname-verification-bypass-in-boring-tls-backend"},{"cve":"CVE-2021-38189","cvss":3.1,"epss":0.0149,"slug":"cve-2021-38189-smtp-command-injection-in-lettre","title":"RUSTSEC-2021-0069 - SMTP command injection in body","severity":"low","exploited":false,"published_at":"2021-05-22T12:00:00+00:00","url":"https://junglewise.ai/threats/cve-2021-38189-smtp-command-injection-in-lettre"},{"cve":"CVE-2020-28247","cvss":3.1,"epss":0.0152,"slug":"cve-2020-28247-argument-injection-in-lettre","title":"RUSTSEC-2020-0069 - Argument injection in sendmail transport","severity":"low","exploited":false,"published_at":"2020-11-11T12:00:00+00:00","url":"https://junglewise.ai/threats/cve-2020-28247-argument-injection-in-lettre"}],"weekly":[{"week":"2026-06-29","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-06","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-13","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-07-20","critical":1,"exploited":0,"vulnerabilities":1},{"week":"2026-07-27","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-03","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-10","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-17","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-24","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-08-31","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-07","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-14","critical":0,"exploited":0,"vulnerabilities":0},{"week":"2026-09-21","critical":0,"exploited":0,"vulnerabilities":0}],"related":[{"name":"surrealdb (crates.io)","slug":"surrealdb","vulnerabilities":118,"url":"https://junglewise.ai/threats/technologies/surrealdb"},{"name":"coreutils (crates.io)","slug":"crates-io-coreutils","vulnerabilities":44,"url":"https://junglewise.ai/threats/technologies/crates-io-coreutils"},{"name":"wasmtime (crates.io)","slug":"wasmtime","vulnerabilities":42,"url":"https://junglewise.ai/threats/technologies/wasmtime"},{"name":"deno (crates.io)","slug":"deno","vulnerabilities":36,"url":"https://junglewise.ai/threats/technologies/deno"},{"name":"zebrad (crates.io)","slug":"zebrad","vulnerabilities":31,"url":"https://junglewise.ai/threats/technologies/zebrad"},{"name":"openssl-src (crates.io)","slug":"openssl-src","vulnerabilities":26,"url":"https://junglewise.ai/threats/technologies/openssl-src"},{"name":"openssl (crates.io)","slug":"crates-io-openssl","vulnerabilities":25,"url":"https://junglewise.ai/threats/technologies/crates-io-openssl"},{"name":"rustfs (crates.io)","slug":"rustfs","vulnerabilities":25,"url":"https://junglewise.ai/threats/technologies/rustfs"},{"name":"ckb (crates.io)","slug":"ckb","vulnerabilities":17,"url":"https://junglewise.ai/threats/technologies/ckb"},{"name":"diesel (crates.io)","slug":"diesel","vulnerabilities":17,"url":"https://junglewise.ai/threats/technologies/diesel"},{"name":"pyo3 (crates.io)","slug":"pyo3","vulnerabilities":15,"url":"https://junglewise.ai/threats/technologies/pyo3"},{"name":"russh (crates.io)","slug":"crates-io-russh","vulnerabilities":13,"url":"https://junglewise.ai/threats/technologies/crates-io-russh"}],"technology":{"hub":true,"name":"lettre (crates.io)","slug":"crates-io-lettre","vendor":{"name":"crates.io","slug":"crates-io","url":"https://junglewise.ai/threats/vendors/crates-io"},"aliases":[],"url":"https://junglewise.ai/threats/technologies/crates-io-lettre"},"most_severe":[{"cve":"CVE-2026-46428","cvss":4,"epss":0.0032,"slug":"cve-2026-46428-lettre-tls-hostname-verification-bypass-in-boring-tls-backend","title":"lettre TLS hostname verification bypass in boring-tls backend","severity":"critical","exploited":false,"published_at":"2026-07-20T16:17:01.347+00:00","url":"https://junglewise.ai/threats/cve-2026-46428-lettre-tls-hostname-verification-bypass-in-boring-tls-backend"},{"cve":"CVE-2020-28247","cvss":3.1,"epss":0.0152,"slug":"cve-2020-28247-argument-injection-in-lettre","title":"RUSTSEC-2020-0069 - Argument injection in sendmail transport","severity":"low","exploited":false,"published_at":"2020-11-11T12:00:00+00:00","url":"https://junglewise.ai/threats/cve-2020-28247-argument-injection-in-lettre"},{"cve":"CVE-2021-38189","cvss":3.1,"epss":0.0149,"slug":"cve-2021-38189-smtp-command-injection-in-lettre","title":"RUSTSEC-2021-0069 - SMTP command injection in body","severity":"low","exploited":false,"published_at":"2021-05-22T12:00:00+00:00","url":"https://junglewise.ai/threats/cve-2021-38189-smtp-command-injection-in-lettre"}],"generated_at":"2026-09-27T03:07:00.185062+00:00"}