CVE-2026-126165: High severity vulnerability

Published Nov 11, 2026
·
Updated

A memory allocation with excessive size value vulnerability in Fortinet FortiMail 8.0.0 through 8.0.1, FortiMail 7.6.0 through 7.6.6, FortiMail 7.4.0 through 7.4.8, FortiMail 7.2 all versions may allow a remote unauthenticated attacker to cause a denial of service via a specially crafted attachment delivered over SMTP.

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade FortiMail to a version that resolves this vulnerability.

    Fixed in 7.4.9
  2. Upgrade

    Upgrade FortiMail to a version that resolves this vulnerability.

    Fixed in 7.6.7
  3. Upgrade

    Upgrade FortiMail to a version that resolves this vulnerability.

    Fixed in 8.0.2

Event History

Nov 11, 2026
CVE Published
via MITRE·09:29 PM
Data Sourced
via MITRE·09:29 PM
RemedyDescriptionSeverityWeakness
Data Sourced
via NVD·10:17 PM
DescriptionSeverityWeakness

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