CVE-2026-45711: Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the mailpit dump --http sub-command downloads every message from a remote Mai

mediumCVSS 5.9CVE-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.

Details

Source: NVD Recent CVEs (US · database · site)
Severity: medium — CVSS 5.9
Published: 2026-07-20
Last updated: 2026-07-21
Exploitation: Not in CISA KEV at last sync

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-45711

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-457110.31% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 24% of all scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-45711	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

medium[UPDATE] [medium] MailPit: Multiple vulnerabilitiescert-bund

Recent advisories for Mailpit is an

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

medium[NEW] [medium] MailPit: Vulnerability allows disclosure of informationcert-bund · 2026-07-29
medium[UPDATE] [medium] MailPit: Vulnerability allows Denial of Servicecert-bund · 2026-07-21
medium[UPDATE] [medium] MailPit: Multiple vulnerabilitiescert-bund · 2026-07-21
mediumCVE-2026-48824: Mailpit is an email testing tool and API for developers. Prior to version 1.30.1, the fix for …nvd · 2026-07-20
highCVE-2026-45713: Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the Mailpit …nvd · 2026-07-20
mediumCVE-2026-45712: Mailpit is an email testing tool and API for developers. Prior to version 1.30.0, the screensh…nvd · 2026-07-20