[NEW] [medium] MailPit: Vulnerability enables Denial of Service

mediumCVE-2026-67447

A remote, anonymous attacker can exploit a vulnerability in MailPit to perform a Denial of Service attack.

CSIRTS triage

vendor: MailPit product: MailPit Denial of service

What: A remote, anonymous attacker can trigger a Denial of Service attack against MailPit.
Who is affected: Any internet-accessible MailPit instance without authentication requirements.
Urgency: Medium severity; denial of service is disruptive but does not expose data or grant code execution.
Action: Apply the security patch for CVE-2026-67447 or restrict network access to MailPit.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity: medium
Published: 2026-08-21
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2949

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-2026-674470.37% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 31% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-67447	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

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

Recent advisories for MailPit

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.

highGHSA-w878-pj84-3j5v: Mailpit: SMTP command parser buffers unbounded command lines before syntax rejectionghsa · 2026-09-02
highGHSA-75mr-qw9x-3r39: Mailpit: Thumbnail generation decodes unbounded image dimensions before scalingghsa · 2026-09-02
medium[NEW] [medium] MailPit: Vulnerability enables disclosure of informationcert-bund · 2026-09-02
mediumCVE-2026-84697: Mailpit's IsInternalIP deny list function fails to block the Azure WireServer address 168.63.1…nvd · 2026-09-02
medium[NEW] [medium] MailPit: Vulnerability allows disclosure of informationcert-bund · 2026-08-21
medium[NEW] [medium] MailPit: Multiple vulnerabilities allow Denial of Servicecert-bund · 2026-08-21