CVE-2026-8806 Denial-of-service (DoS) vulnerability in MELSEC iQ-F Series FX5-ENET/IP Ethernet module
Remote attackers can cause denial of service in Mitsubishi MELSEC iQ-F Ethernet modules by flooding the port with packets, stopping communication functions.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-8806?
CVE-2026-8806 is a high-severity denial of service vulnerability in Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP, published on 19 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Expected Behavior Violation vulnerability in Mitsubishi Electric MELSEC iQ-F Series FX5-ENET/IP Ethernet Module FX5-ENET/IP all versions allows a remote attacker to cause a denial-of-service (DoS) condition in the affected product by continuously sending a large number of communication packets to the Ethernet port of the product in a short period of time, increasing the processing load of the product, preventing the internal anomaly-detection processing from being performed, and causing the communication function to stop.
Weakness: CWE-440
Which versions are affected by CVE-2026-8806?
How do I fix CVE-2026-8806?
No fix has been published for CVE-2026-8806 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-2026-8806 being exploited?
There is no known exploitation of CVE-2026-8806 in the wild and no public exploit code.
Sources
Also known as GHSA-8vpf-2whm-fffj.