CVE-2026-45711

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.

• CWE-22
• CWE-829

• https://github.com/axllent/mailpit/releases/tag/v1.30.0Release Notes
• https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4jExploit, Vendor Advisory
• https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4jExploit, Vendor Advisory

Published

Jul 20, 2026

Last Modified

Jul 28, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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