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Vulnerability · Published Jul 14, 2026 · Assigned by fortinet

CVE-2026-59840

Medium 4.1

In plain English

A medium-severity security flaw in FortiOS from Fortinet. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 24% of all known vulnerabilities).

Severity (CVSS 3.1)4.1Medium
Exploit odds (30 days)0.3%top 75.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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 (as reported)

VendorProductVersions
Fortinet FortiOS 7.6.0 – through 7.6.37.4.0 – through 7.4.87.2.0 – through 7.2.137.0.0 – through 7.0.196.4.0 – through 6.4.16
Fortinet FortiPAM 1.7.01.6.0 – through 1.6.21.5.0 – through 1.5.11.4.0 – through 1.4.31.3.0 – through 1.3.11.2.01.1.0 – through 1.1.21.0.0 – through 1.0.3
Fortinet FortiSwitchManager 7.2.0 – through 7.2.77.0.0 – through 7.0.6
Fortinet FortiProxy 7.6.0 – through 7.6.57.4.0 – through 7.4.137.2.0 – through 7.2.167.0.0 – through 7.0.23

Weakness: CWE-126 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:P/RL:O/RC:C

References