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High severity7.5NVD Advisory· Published Nov 11, 2026

CVE-2026-126165

CVE-2026-126165

Description

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.

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Affected products

2
  • Fortinet/Fortimailinferred2 versions
    >=7.2.0+ 1 more
    • (no CPE)range: >=7.2.0
    • (no CPE)range: 8.0.0 through 8.0.1, 7.6.0 through 7.6.6, 7.4.0 through 7.4.8, 7.2

Patches

Vulnerability mechanics

References

1

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