CVE-2026-45711

Summary

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 Software

VendorProductVersion RangeStatus
axllentmailpit< 1.30.0affected

Weaknesses

  • CWE-22: CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
  • CWE-829: CWE-829: Inclusion of Functionality from Untrusted Control Sphere

References