Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Axllent | Mailpit | < 1.30.0 |
Related Weaknesses (CWE)
References
- https://github.com/axllent/mailpit/releases/tag/v1.30.0Release Notes
- https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4jExploitVendor Advisory
- https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4jExploitVendor Advisory
FAQ
What is CVE-2026-45711?
CVE-2026-45711 is a vulnerability with a CVSS score of 5.9 (MEDIUM). 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 wr...
How severe is CVE-2026-45711?
CVE-2026-45711 has been rated MEDIUM with a CVSS base score of 5.9/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-45711?
Check the references section above for vendor advisories and patch information. Affected products include: Axllent Mailpit.