Path Traversal in Axllent Mailpit
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.9 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:L.
EPSS exploit prediction
EPSS: 0.004 (31.8th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 32nd percentile — 31.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.004 · change: +0.001
Affected products
- Axllent Mailpit — versions < 1.30.0
Weakness classification (CWE)
References
- github.com/axllent/mailpit/security/advisories/GHSA-qx5x-85p8-vg4j (Exploit, Vendor Advisory)
- github.com/axllent/mailpit/releases/tag/v1.30.0 (Release Notes)
Frequently asked questions
- What is CVE-2026-45711?
- CVE-2026-45711 is a medium-severity vulnerability in Axllent Mailpit, classified under Path Traversal. CVSS score: 5.9/10. Published 2026-07-20.
- How severe is CVE-2026-45711?
- Medium severity. CVSS v3 base score is 5.9 out of 10.