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.
Affected products
axllent: mailpit
References3
- github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-v… ExploitVendor Advisory
- github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-v… ExploitVendor Advisory
- github.com/axllent/mailpit/releases/tag/v1.30.0 Release Notes
Metrics
- CVSS 3.1
-
8.2
HIGH
Score source: NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L - EPSS — exploit probability
- 0% percentile: 34 · as of 14 November 2026
- CWE
- CWE-22CWE-829
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