Lettre is a mail-composition library providing Rust developers with SMTP and email-building abstractions, offering a niche but widely embedded component in email infrastructure. Its observed vulnerability signal centers on command-injection risks in email-handling workflows and requires careful input validation where user-controlled data influences message construction or SMTP interactions. Current exploitation activity, severity distribution, and exposure counts are shown alongside this summary.
The number and severity of CVEs published that impact products developed by Lettre over time
Signals from CVEs in this vendor scope (2 CVEs).
2 CVEs · Highest risk first
| CVE | Published | CVSS | Risk | KEV | Exploit |
|---|---|---|---|---|---|
CVE-2021-38189CRITICAL 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 arbit | Aug 8, 2021 | 9.8 | 29 | NO | NO |
CVE-2020-28247MEDIUM The lettre library through 0.10.0-alpha for Rust allows arbitrary sendmail option injection via transport/sendmail/mod.rs. | Nov 12, 2020 | 5.3 | 19 | NO | NO |
Signals from CVEs in this vendor scope (2 CVEs).
An overview of all social media posts that mention a CVE ID that affects a product developed by Lettre.
Media articles that mention a CVE ID that affects a product developed by Lettre — matched by CVE ID, not by vendor name.