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CVE-2026-59840

MEDIUM

4.3

CVSS Score

Published: July 14, 2026 at 03:19 PM UTC

Updated: October 24, 2026 at 09:10 PM UTC

5 products affected across 2 vendorsFortiOSFortiProxyFortiPAM

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Severity

MEDIUM4.3

Exploit prediction

EPSS 0.3%

SSVC

No known exploit

Description

A buffer over-read vulnerability in Fortinet FortiOS 7.6.0 through 7.6.2, FortiOS 7.4.0 through 7.4.8, FortiOS 7.2 all versions, FortiProxy 7.6.0 through 7.6.5, FortiProxy 7.4.0 through 7.4.13, FortiProxy 7.2 all versions may allow attacker to information disclosure via <insert attack vector here>

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

FortiOS · Fortinet

95%

7.2.0 ≤ v < 7.4.97.6.0 ≤ v ≤ 7.6.26.4.0 6.4.1 6.4.10 6.4.11 6.4.12 6.4.13 6.4.14 6.4.15 6.4.16 6.4.2 6.4.3 6.4.4 6.4.5 6.4.6 6.4.7 6.4.8 6.4.9 7.0.0 7.0.1 7.0.10 7.0.11 7.0.12 7.0.13 7.0.14 7.0.15 7.0.16 7.0.17 7.0.18 7.0.19 7.0.2 7.0.3 7.0.4 7.0.5 7.0.6 7.0.7 7.0.8 7.0.9 7.2.0 7.2.1 7.2.10 7.2.11 7.2.12 7.2.13 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 7.2.7 7.2.8 7.2.9 7.4.0 7.4.1 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 7.4.7 7.4.8 7.6.0 7.6.1 7.6.2 7.6.3

Affected range stops below 7.4.9, so it looks safe — our inference, not a vendor statement

FortiProxy · Fortinet

95%

7.2.0 ≤ v < 7.4.147.6.0 ≤ v < 7.6.67.0.0 7.0.1 7.0.10 7.0.11 7.0.12 7.0.13 7.0.14 7.0.15 7.0.16 7.0.17 7.0.18 7.0.19 7.0.2 7.0.20 7.0.21 7.0.22 7.0.23 7.0.3 7.0.4 7.0.5 7.0.6 7.0.7 7.0.8 7.0.9 7.2.0 7.2.1 7.2.10 7.2.11 7.2.12 7.2.13 7.2.14 7.2.15 7.2.16 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 7.2.7 7.2.8 7.2.9 7.4.0 7.4.1 7.4.10 7.4.11 7.4.12 7.4.13 7.4.2 7.4.3 7.4.4 7.4.5 7.4.6 7.4.7 7.4.8 7.4.9 7.6.0 7.6.1 7.6.2 7.6.3 7.6.4 7.6.5

Affected range stops below 7.4.14, so it looks safe — our inference, not a vendor statement

Affected range stops below 7.6.6, so it looks safe — our inference, not a vendor statement

FortiPAM · Fortinet

90%

1.0.0 1.0.1 1.0.2 1.0.3 1.1.0 1.1.1 1.1.2 1.2.0 1.3.0 1.3.1 1.4.0 1.4.1 1.4.2 1.4.3 1.5.0 1.5.1 1.6.0 1.6.1 1.6.2 1.7.0

FortiSwitchManager · Fortinet

90%

7.0.0 7.0.1 7.0.2 7.0.3 7.0.4 7.0.5 7.0.6 7.2.0 7.2.1 7.2.2 7.2.3 7.2.4 7.2.5 7.2.6 7.2.7

RUGGEDCOM APE1808 Firmware · Siemens

60%

All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

https://fortiguard.fortinet.com/psirt/FG-IR-26-154

References (2)

Vendor Advisory

Source: cverecord

https://fortiguard.fortinet.com/psirt/FG-IR-26-154

Source: 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e

https://cert-portal.siemens.com/productcert/html/ssa-864900.html

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.3MEDIUM[email protected]

Attack Vector: NETWORK
Complexity: LOW
Privileges: LOW
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: LOW
Integrity: NONE
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-126

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