CVE-2026-41227 BIG-IP HTTP/2 Layer 7 Dos Protection vulnerability

High 8.7 Published 13 May 2026 Updated 13 May 2026

Attackers can cause a denial of service by triggering memory exhaustion in the TMM process on BIG-IP systems with Layer 7 DoS Protection enabled.

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-2026-41227?

CVE-2026-41227 is a high-severity denial of service vulnerability in F5 Big-Ip Advanced Web Application Firewall, published on 13 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

On an HTTP/2 virtual server with Layer 7 DoS Protection configured, undisclosed traffic can result in an increase in memory consumption causing the Traffic Management Microkernel (TMM) process to terminate. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

Weakness: CWE-770

Which versions are affected by CVE-2026-41227?

It affects 3 products.

Products include F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Application Security Manager, F5 Big-Ip Ddos Hybrid Defender.

How do I fix CVE-2026-41227?

No fix has been published for CVE-2026-41227 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-2026-41227 being exploited?

There is no known exploitation of CVE-2026-41227 in the wild and no public exploit code.

All F5 Big-Ip Advanced Web Application Firewall vulnerabilities

Sources

Also known as GHSA-mggm-3mvj-fj65.