CVE-2026-84391 Denial of service in FortiAnalyzer
An attacker can cause a denial of service in Fortinet FortiAnalyzer by exploiting an uninitialized variable vulnerability.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-84391?
CVE-2026-84391 is a medium-severity denial of service vulnerability in Fortinet FortiAnalyzer, published on 8 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
A use of uninitialized variable vulnerability in Fortinet FortiAnalyzer 7.6.3 through 7.6.6 may allow attacker to denial of service via <insert attack vector here>
Weakness: CWE-457
Which versions are affected by CVE-2026-84391?
How do I fix CVE-2026-84391?
No fix has been published for CVE-2026-84391 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-84391 being exploited?
There is no known exploitation of CVE-2026-84391 in the wild and no public exploit code.
Sources
Also known as GHSA-f3rw-5qfx-8w2r.