Description
In msmtp 1.8.2 and mpop 1.4.3, when tls_trust_file has its default configuration, certificate-verification results are not properly checked.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mpop | 1.4.3-1 | — |
| Debian 14 | msmtp | 1.8.3-1 | — |
| Debian 13 | mpop | 1.4.3-1 | — |
| Debian 13 | msmtp | 1.8.3-1 | — |
| Debian 12 | mpop | 1.4.3-1 | — |
| Debian 12 | msmtp | 1.8.3-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 20.04 LTS | mpop | 1.4.3-1 | — |
| Ubuntu 18.04 LTS | msmtp | No fix yet | — |
| Ubuntu 16.04 LTS | msmtp | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mstmp | 1.8.16-1.1 | openSUSE-SU-2024:11064-1 |
Advisories 1
- openSUSE-SU-2024:11064-1 msmtp-1.8.16-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026