CVE-2026-45711

Mailpit: Path traversal & arbitrary file write in mailpit dump --http via attacker-controlled message IDs

State: Published
Severity: 5.9 Medium
Published: Jul 20, 2026
Updated: Jul 21, 2026
Reserved: May 13, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L	GitHub_M

Weaknesses

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

Affected Products

Product	Versions
mailpitaxllent	< 1.30.0Affected

References

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