# CVE-2026-126223: Fortinet FortiAnalyzer stack-based buffer overflow in JSON-RPC API

Source: https://junglewise.ai/threats/cve-2026-126223-a-stack-based-buffer-overflow-vulnerability-in-fortinet  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-11-11. Updated: 2026-11-11  
License: CC BY 4.0 with a link back

CVE-2026-126223 · Severity: high · CVSS 7.2 · Published 2026-11-11

FortiAnalyzer and FortiManager are enterprise management and logging systems that aggregate security events and manage firewall configurations across networks. A stack-based buffer overflow in their JSON-RPC API allows authenticated administrators to execute arbitrary code or crash the system by sending specially crafted requests. An attacker with admin credentials could gain complete control of the management infrastructure or disrupt network monitoring and policy enforcement.

Technologies: [Fortinet Fortianalyzer](https://junglewise.ai/threats/technologies/fortianalyzer), [Fortinet Fortianalyzer Cloud](https://junglewise.ai/threats/technologies/fortianalyzer-cloud), [Fortinet FortiManager](https://junglewise.ai/threats/technologies/fortimanager), [Fortinet FortiManager Cloud](https://junglewise.ai/threats/technologies/fortimanager-cloud). Vendors: [Fortinet](https://junglewise.ai/threats/vendors/fortinet).

## Quick answers

**Is CVE-2026-126223 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126223 being exploited in the wild.

**How severe is CVE-2026-126223?** High severity, with a CVSS score of 7.2, published 11 November 2026.

**Which products and versions are affected?** Fortinet Fortianalyzer 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.11; Fortinet Fortianalyzer Cloud 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.1 through 7.4.11; Fortinet FortiManager 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.11; Fortinet FortiManager Cloud 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.1 through 7.4.11.

**Is there a fix for CVE-2026-126223?** Yes: fixed in FortiAnalyzer 8.0.2, 7.6.8, 7.4.12; FortiAnalyzer Cloud 8.0.2, 7.6.8, 7.4.12; FortiManager 8.0.2, 7.6.8, 7.4.12; FortiManager Cloud 8.0.2, 7.6.8, 7.4.12. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-126223 attacked?** It is attacked over the network, in a network appliance.

**Am I affected by CVE-2026-126223?** Check whether you run Fortinet Fortianalyzer, Fortinet Fortianalyzer Cloud, Fortinet FortiManager or one of the others listed at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## How to fix

- Fixed in FortiAnalyzer 8.0.2, 7.6.8, 7.4.12; FortiAnalyzer Cloud 8.0.2, 7.6.8, 7.4.12; FortiManager 8.0.2, 7.6.8, 7.4.12; FortiManager Cloud 8.0.2, 7.6.8, 7.4.12

## Technical details

A stack-based buffer overflow (CWE-121) exists in the JSON-RPC API of FortiAnalyzer and FortiManager versions 7.4.0–7.4.11, 7.6.0–7.6.7, and 8.0.0–8.0.1. The vulnerability requires authenticated administrator access and is triggered by maliciously formatted JSON-RPC requests. Successful exploitation allows code execution or denial of service.

## Affected products

- Fortinet FortiAnalyzer 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.11
- Fortinet FortiAnalyzer Cloud 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.1 through 7.4.11
- Fortinet FortiManager 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.0 through 7.4.11
- Fortinet FortiManager Cloud 8.0.0 through 8.0.1, 7.6.0 through 7.6.7, 7.4.1 through 7.4.11

## Timeline

- 2026-11-10: disclosed

## References

- [https://fortiguard.fortinet.com/psirt/FG-IR-26-238](https://fortiguard.fortinet.com/psirt/FG-IR-26-238)

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