CVE-2026-45711
Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs
Impact
Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http <base-url> <out-dir> sub-command downloads every message from a remote Mailpit instance and writes each one as <id>.eml inside the user-supplied output directory. The message ID field is taken verbatim from the JSON response of the remote server and concatenated into the output path with path.Join, which silently normalizes `..` segments. A malicious HTTP server impersonating Mailpit can therefore make mailpit dump write attacker-controlled bytes to any path the running user can write, fully outside the intended output directory. Version 1.30.0 contains a patch.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/axllent/mailpit | < 1.30.0 | 1.30.0 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Axllent | Mailpit | before 1.30.0 |