CVE-2026-59837Network attack vector

Administrator code execution via log-report stack overflow

Published Jul 14, 2026 · Updated Jul 14, 2026

Stack-based buffer overflow in Fortinet FortiOS, FortiPAM, FortiProxy, and FortiSASE allows remote authenticated users to execute code. The flaw resides in the Log & Report component, but Fortinet has not identified the HTTP field or memory-copy operation that overruns the stack. Exploitation requires a privileged authenticated account, crafted HTTP requests, and bypasses of stack protection and ASLR; success runs arbitrary code or commands.

CVSS severity6.6
Medium
EPSS probability0.67%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflow in Fortinet FortiOS, FortiPAM, FortiProxy, and FortiSASE allows remote authenticated users to execute code. The flaw resides in the Log & Report component, but Fortinet has not identified the HTTP field or memory-copy operation that overruns the stack. Exploitation requires a privileged authenticated account, crafted HTTP requests, and bypasses of stack protection and ASLR; success runs arbitrary code or commands.

The record

CVE
CVE-2026-59837
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Fortinet
Product
FortiSASE
Classifications
CWE-121, T1190
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=26.1.1 <=26.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Fortinet · FortiSASEversion=26.1.1 <=26.1.2
Fortinet · FortiOSversion=6.4.0 <=6.4.16; version=7.0.0 <=7.0.19; version=7.2.0 <=7.2.13; version=7.4.0 <=7.4.1
Fortinet · FortiPAMversion=1.0.0 <=1.0.3; version=1.1.0 <=1.1.2; version=1.2.0; version=1.3.0 <=1.3.1; version=1.4.0 <=1.4.3; version=1.5.0 <=1.5.1; version=1.6.0 <=1.6.2; version=1.7.0 <=1.7.2; version=1.8.0 <=1.8.2
Fortinet · FortiProxyversion=7.2.0 <=7.2.16; version=7.4.0 <=7.4.13

Published CVSS scores

6.6FortinetCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-121Stack-based Buffer Overflow
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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