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.

CVSS 3.1

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:L

EPSS

0.4% chance of exploitation in the next 30 days; higher than 32% of CVEs (scores of 2026-10-25)

CWEs

CWE-22, CWE-829

Published

2026-07-20

Modified

2026-10-24

Record from

the NVD, synced 2026-10-25

Affected

• axllent:mailpit

Packages (OSV)

References

• https://github.com/axllent/mailpit/releases/tag/v1.30.0
• https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j
• https://github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j

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