CVE-2026-45711
Description
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.
How to fix
- axllent mailpit1.30.0 or later
- github.com/axllent/mailpit1.30.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| axllent mailpit | v < 1.30.0 | 1.30.0 |
| github.com/axllent/mailpitGo | v < 1.30.0 | 1.30.0 |
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