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CVE-2026-46428

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 (`na
Lifecycle PUBLISHED1 preserved revisionFact urn:baitaphish:canonical-cve-fact-revision:v2:233c9f28f4f98c5dcba2978120eada14af7239e4033f0e64bdc02b46163548d2
Known exploited
Not asserted
Disputed
No
Stale source
No
Conflicts
0

Affected products and versions

1 source assertion
{"product":"lettre","vendor":"lettre","versions":[{"status":"affected","version":">= 0.10.1, < 0.11.22"}]}
  • cve_program_cvelist_v5affected
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/affected/0

Provider-owned CVSS observations

1 source assertion
{"metric":{"attackComplexity":"LOW","attackRequirements":"PRESENT","attackVector":"NETWORK","baseScore":9.1,"baseSeverity":"CRITICAL","privilegesRequired":"NONE","subAvailabilityImpact":"NONE","subConfidentialityImpact":"LOW","subIntegrityImpact":"LOW","userInteraction":"NONE","vectorString":"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","version":"4.0","vulnAvailabilityImpact":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH"},"metric_type":"cvssV4_0"}
  • cve_program_cvelist_v5cvss
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/metrics/0/cvssV4_0

CWE assertions

1 source assertion
{"cweId":"CWE-295","description":"CWE-295: Improper Certificate Validation","lang":"en","type":"CWE"}
  • cve_program_cvelist_v5cwe
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/problemTypes/0/descriptions/0

Source references

5 source assertions
{"name":"https://github.com/lettre/lettre/commit/f5efffc88360dbdbfcef80f465e42d5bce68ca35","tags":["x_refsource_MISC"],"url":"https://github.com/lettre/lettre/commit/f5efffc88360dbdbfcef80f465e42d5bce68ca35"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/references/1
{"name":"https://github.com/lettre/lettre/releases/tag/v0.11.22","tags":["x_refsource_MISC"],"url":"https://github.com/lettre/lettre/releases/tag/v0.11.22"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/references/2
{"name":"https://github.com/lettre/lettre/security/advisories/GHSA-4pj9-g833-qx53","tags":["x_refsource_CONFIRM"],"url":"https://github.com/lettre/lettre/security/advisories/GHSA-4pj9-g833-qx53"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/references/0
{"tags":["exploit"],"url":"https://github.com/lettre/lettre/security/advisories/GHSA-4pj9-g833-qx53"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/adp/0/references/0
{"name":"https://rustsec.org/advisories/RUSTSEC-2026-0141.html","tags":["x_refsource_MISC"],"url":"https://rustsec.org/advisories/RUSTSEC-2026-0141.html"}
  • cve_program_cvelist_v5reference
    urn:baitaphish:normalized-source-record:v2:3c7169ce59a8003def773e09d21a68992628d815b7a5c1c24bb4d1a0f41b87a1 · sha256:0446833dbacf1519… · /containers/cna/references/3

Attribution and limitations

  • CVE Program CVEList V5: Reproduce the MITRE copyright designation and CVE license in copies. Source →

Provider severity values are preserved separately. Baitaphish does not convert them into a risk rating, infer affected products, or treat EPSS as observed exploitation.

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