CVE-2026-59837: Fortinet FortiOS

Medium severity, CVSS 6.6. EPSS: 0.7% chance of exploitation in the next 30 days.

A stack-based buffer overflow vulnerability in Fortinet FortiOS 7.4.0 through 7.4.1, FortiOS 7.2 all versions, FortiPAM 1.8.0 through 1.8.2, FortiPAM 1.7 all versions, FortiPAM 1.6 all versions, FortiPAM 1.5 all versions, FortiPAM 1.4 all versions, FortiPAM 1.3 all versions, FortiPAM 1.2 all versions, FortiPAM 1.1 all versions, FortiPAM 1.0 all versions, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions may allow a privileged authenticated attacker who can bypass stack protection and ASLR to execute arbitrary code or commands via crafted HTTP requests.

Affected products

• Fortinet FortiOS: from 7.2.0, before 7.4.2 (fixed in 7.4.2)
• Fortinet Fortipam: from 1.0.0, before 1.8.3 (fixed in 1.8.3)
• Fortinet FortiProxy: from 7.2.0, before 7.4.14 (fixed in 7.4.14)

Published 2026-07-14. Last modified 2026-08-11.