CVE-2026-126223 Memory corruption in FortiAnalyzer
An authenticated administrator can send crafted JSON-RPC requests to overflow a stack buffer and execute code or crash FortiAnalyzer and FortiManager.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Harmful if only installed
- No
- Needs a specific call
- No
- Fix
- None listed
What is CVE-2026-126223?
CVE-2026-126223 is a high-severity memory corruption vulnerability in Fortinet FortiAnalyzer, published on 11 Nov 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
A stack-based buffer overflow vulnerability in Fortinet FortiAnalyzer 8.0.0 through 8.0.1, FortiAnalyzer 7.6.0 through 7.6.7, FortiAnalyzer 7.4.0 through 7.4.11, FortiAnalyzer Cloud 8.0.0 through 8.0.1, FortiAnalyzer Cloud 7.6.0 through 7.6.7, FortiAnalyzer Cloud 7.4.1 through 7.4.11, FortiManager 8.0.0 through 8.0.1, FortiManager 7.6.0 through 7.6.7, FortiManager 7.4.0 through 7.4.11, FortiManager Cloud 8.0.0 through 8.0.1, FortiManager Cloud 7.6.0 through 7.6.7, FortiManager Cloud 7.4.1 through 7.4.11 may allow an authenticated administrator to execute unauthorized code or commands or cause a denial of service via specially crafted JSON-RPC requests.
Weakness: CWE-121
Which versions are affected by CVE-2026-126223?
An affected version is exposed as installed. No special setting or call is needed.
How do I fix CVE-2026-126223?
No fix has been published for CVE-2026-126223 yet. Limit exposure of the affected software until one is available.
Upgrade to the fixed version. Memory-safe languages, compiler hardening and fuzzing prevent most new cases. More about Memory corruption.
Is CVE-2026-126223 being exploited?
There is no known exploitation of CVE-2026-126223 in the wild and no public exploit code.
Sources
Also known as GHSA-pfmg-237p-2xxx.