The lettre library through 0.10.0-alpha for Rust allows arbitrary sendmail option…
Priority LOW 27CWE-77Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Code execution
- Confidentiality · integrity · availability
- None · Low · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · NVD. Fix status from CNA and GitHub. Impact type from CWE-77.
Summary
The lettre library through 0.10.0-alpha for Rust allows arbitrary sendmail option injection via transport/sendmail/mod.rs.
Why it matters now
EPSS 0.01522 74th percentileScored 2026-11-07
Fix Fixed lettre (crates.io): 0.9.5, 0.8.4, 0.7.1
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | lettre (crates.io) | 0.9.0 to before 0.9.5 | 0.9.5 | Patch available | GHSA-vc2p-r46x-m3vx |
| — | lettre (crates.io) | 0.8.0 to before 0.8.4 | 0.8.4 | Patch available | GHSA-vc2p-r46x-m3vx |
| — | lettre (crates.io) | 0.7.0 to before 0.7.1 | 0.7.1 | Patch available | GHSA-vc2p-r46x-m3vx |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- lettre (crates.io) Vendor— Affected 0.9.0 to before 0.9.5 Fixed in 0.9.5 Patch available GHSA-vc2p-r46x-m3vx
- lettre (crates.io) Vendor— Affected 0.8.0 to before 0.8.4 Fixed in 0.8.4 Patch available GHSA-vc2p-r46x-m3vx
- lettre (crates.io) Vendor— Affected 0.7.0 to before 0.7.1 Fixed in 0.7.1 Patch available GHSA-vc2p-r46x-m3vx
CPE configurations NVD · 5
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:* | 0.8.0 – 0.8.3; 0.9.0 – 0.9.5 | Vulnerable | lettre |
| cpe:2.3:a:lettre:lettre:0.7.0:*:*:*:*:*:*:* | 0.7.0 | Vulnerable | lettre |
| cpe:2.3:a:lettre:lettre:0.10.0:alpha1:*:*:*:*:*:* | 0.10.0 alpha1 | Vulnerable | lettre |
| cpe:2.3:a:lettre:lettre:0.10.0:alpha2:*:*:*:*:*:* | 0.10.0 alpha2 | Vulnerable | lettre |
| cpe:2.3:a:lettre:lettre:0.10.0:alpha3:*:*:*:*:*:* | 0.10.0 alpha3 | Vulnerable | lettre |
- cpe:2.3:a:lettre:lettre:*:*:*:*:*:*:*:* Versions 0.8.0 – 0.8.3; 0.9.0 – 0.9.5 Vulnerable ·lettre
- cpe:2.3:a:lettre:lettre:0.7.0:*:*:*:*:*:*:* Versions 0.7.0 Vulnerable ·lettre
- cpe:2.3:a:lettre:lettre:0.10.0:alpha1:*:*:*:*:*:* Versions 0.10.0 alpha1 Vulnerable ·lettre
- cpe:2.3:a:lettre:lettre:0.10.0:alpha2:*:*:*:*:*:* Versions 0.10.0 alpha2 Vulnerable ·lettre
- cpe:2.3:a:lettre:lettre:0.10.0:alpha3:*:*:*:*:*:* Versions 0.10.0 alpha3 Vulnerable ·lettre
Remediation
- Fix · GHSA-vc2p-r46x-m3vx lettre (crates.io) Fixed in 0.9.5 Advisory →
- Fix · GHSA-vc2p-r46x-m3vx lettre (crates.io) Fixed in 0.8.4 Advisory →
- Fix · GHSA-vc2p-r46x-m3vx lettre (crates.io) Fixed in 0.7.1 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2020-28247
- 2026-10-03 Alias added: GHSA-vc2p-r46x-m3vx
References
Advisory 3
More Lettre vulnerabilities
- TI-2021-15866 An issue was discovered in the lettre crate before 0.9.6 for Rust. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2020-28247 · CVE Program
- CVE-2020-28247 · NVD
- FIRST EPSS
- GHSA-vc2p-r46x-m3vx · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences