# CVE-2026-126212: Fortinet FortiAnalyzer heap-based buffer overflow in JSON-RPC API

Source: https://junglewise.ai/threats/cve-2026-126212-a-heap-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-2026-126212 · Severity: high · CVSS 7.2 · Published 2026-11-11

FortiAnalyzer and FortiManager are centralized management and log analysis platforms that monitor and control enterprise firewalls and security infrastructure. A heap-based buffer overflow in their JSON-RPC API allows authenticated administrators to execute arbitrary code or crash the system by sending specially crafted requests. This could enable a malicious admin to compromise the entire managed security infrastructure or disrupt operations.

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-2026-126212 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-126212 being exploited in the wild.

**How severe is CVE-2026-126212?** 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-2026-126212?** Yes: fixed in FortiAnalyzer 8.0.2 or above, 7.6.8 or above, 7.4.12 or above; FortiAnalyzer Cloud 8.0.2 or above, 7.6.8 or above, 7.4.12 or above; FortiManager 8.0.2 or above, 7.6.8 or above, 7.4.12 or above; FortiManager Cloud 8.0.2 or above, 7.6.8 or above, 7.4.12 or above. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-126212 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-126212?** 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 or above, 7.6.8 or above, 7.4.12 or above; FortiAnalyzer Cloud 8.0.2 or above, 7.6.8 or above, 7.4.12 or above; FortiManager 8.0.2 or above, 7.6.8 or above, 7.4.12 or above; FortiManager Cloud 8.0.2 or above, 7.6.8 or above, 7.4.12 or above

## Technical details

A heap-based buffer overflow (CWE-122) exists in the JSON-RPC API component of FortiAnalyzer, FortiAnalyzer Cloud, FortiManager, and FortiManager Cloud. The vulnerability requires authentication as an administrator and is triggered via malformed JSON-RPC requests. Successful exploitation allows arbitrary 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-26-232](https://fortiguard.fortinet.com/psirt/FG-IR-26-232)

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