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.
Fix
Patch, vendor advisory and mitigation references on NVD 2
- https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j Exploit, Vendor Advisory
- https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j Exploit, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 8.2 · axllentNVD modified 2026-10-24 20:10
Affected (CPE criteria) 1
cpe:2.3:a:axllent:mailpit:*:*:*:*:*:*:*:*
References 3
- https://github.com/axllent/mailpit/releases/tag/v1.30.0 Release Notes
- https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j Exploit, Vendor Advisory
- https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j Exploit, Vendor Advisory