Out-of-bounds write in FortiMail - CVE-2026-126154
Published: November 11, 2026
Vulnerability identifier: #VU165153
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-126154
CWE-ID: CWE-787
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to out-of-bounds write. A remote unauthenticated attacker can cause a denial of service via a specially crafted HTTP request.
Affected software
FortiMail
How to mitigate CVE-2026-126154
Install update from vendor's website.
FortiMail - addressed in versions 7.4.9, 7.6.7, 8.0.2