What’s Vulnerable › Vulnerabilities

CVE-2026-59840

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-14 · updated 2026-10-24
• Weakness: CWE-126

Description

A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.3, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions, FortiProxy 7.0 all versions may allow attacker to information disclosure via <insert attack vector here>

Affected products

• Fortinet FortiOS (FortiGate): from 7.2.0 before 7.4.9; from 7.6.0 through 7.6.2 — fixed in 7.4.9
• Fortinet FortiProxy: from 7.2.0 before 7.4.14; from 7.6.0 before 7.6.6 — fixed in 7.4.14, 7.6.6

How to fix

Upgrade to a fixed version: Fortinet FortiOS (FortiGate) 7.4.9; Fortinet FortiProxy 7.4.14, 7.6.6. Check the vendor advisory for mitigations.

References

• https://fortiguard.fortinet.com/psirt/FG-IR-26-154
• https://cert-portal.siemens.com/productcert/html/ssa-864900.html

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