CVE-2026-40061 iControl REST and tmsh vulnerability
Authenticated administrators can execute arbitrary system commands with higher privileges in BIG-IP DNS, potentially crossing security boundaries in Appliance mode.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-40061?
CVE-2026-40061 is a high-severity command injection vulnerability in F5 Big-Ip Domain Name System, published on 13 May 2026. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed iControl REST and BIG-IP TMOS Shell (tmsh) command that may allow an authenticated attacker with the Resource Administrator or Administrator role to execute arbitrary system commands with higher privileges. In Appliance mode deployments, a successful exploit can allow the attacker to cross a security boundary. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness: CWE-77
Which versions are affected by CVE-2026-40061?
It affects 1 product.
Products include F5 Big-Ip Domain Name System.
How do I fix CVE-2026-40061?
No fix has been published for CVE-2026-40061 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-40061 being exploited?
There is no known exploitation of CVE-2026-40061 in the wild and no public exploit code.
Other vulnerabilities in F5 Big-Ip Domain Name System
Sources
Also known as GHSA-rpj4-762v-f8r2.