CVE-2026-39459: iControl REST and tmsh vulnerability
Published May 13, 2026
·Updated
A vulnerability exists in iControl REST and the TMOS Shell (tmsh) where a highly privileged, authenticated attacker with at least the Manager role can create configuration objects that allow running arbitrary commands.
Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Affected Software
86 affected components
F5 BIG-IP iControl REST
F5 BIG-IP TMOS Shell (tmsh)
F5 BIG-IP Access Policy Manager>=17.1.0<=17.1.3
F5 BIG-IP Access Policy Manager>=17.5.0<=17.5.1
F5 BIG-IP Advanced Firewall Manager>=17.1.0<=17.1.3
F5 BIG-IP Advanced Firewall Manager>=17.5.0<=17.5.1
F5 Big-ip Advanced Web Application Firewall>=17.1.0<=17.1.3
F5 Big-ip Advanced Web Application Firewall>=17.5.0<=17.5.1
F5 BIG-IP Analytics>=17.1.0<=17.1.3
F5 BIG-IP Analytics>=17.5.0<=17.5.1
F5 Big-ip Application Acceleration Manager>=17.1.0<=17.1.3
F5 Big-ip Application Acceleration Manager>=17.5.0<=17.5.1
F5 BIG-IP Application Security Manager>=17.1.0<=17.1.3
F5 BIG-IP Application Security Manager>=17.5.0<=17.5.1
F5 Big-ip Application Visibility And Reporting>=17.1.0<=17.1.3
F5 Big-ip Application Visibility And Reporting>=17.5.0<=17.5.1
F5 Big-ip Automation Toolchain>=17.1.0<=17.1.3
F5 Big-ip Automation Toolchain>=17.5.0<=17.5.1
F5 Big-ip Carrier-grade Nat>=17.1.0<=17.1.3
F5 Big-ip Carrier-grade Nat>=17.5.0<=17.5.1
F5 BIG-IP Container Ingress Services>=17.1.0<=17.1.3
F5 BIG-IP Container Ingress Services>=17.5.0<=17.5.1
F5 Big-ip Ddos Hybrid Defender>=17.1.0<=17.1.3
F5 Big-ip Ddos Hybrid Defender>=17.5.0<=17.5.1
F5 Big-ip Domain Name System>=17.1.0<=17.1.3
F5 Big-ip Domain Name System>=17.5.0<=17.5.1
F5 BIG-IP Edge Gateway>=17.1.0<=17.1.3
F5 BIG-IP Edge Gateway>=17.5.0<=17.5.1
F5 Big-ip Fraud Protection Service>=17.1.0<=17.1.3
F5 Big-ip Fraud Protection Service>=17.5.0<=17.5.1
F5 Big-ip Global Traffic Manager>=17.1.0<=17.1.3
F5 Big-ip Global Traffic Manager>=17.5.0<=17.5.1
F5 Big-ip Link Controller>=17.1.0<=17.1.3
F5 Big-ip Link Controller>=17.5.0<=17.5.1
F5 Big-ip Local Traffic Manager>=17.1.0<=17.1.3
F5 Big-ip Local Traffic Manager>=17.5.0<=17.5.1
F5 Big-ip Policy Enforcement Manager>=17.1.0<=17.1.3
F5 Big-ip Policy Enforcement Manager>=17.5.0<=17.5.1
F5 BIG-IP SSL Orchestrator>=17.1.0<=17.1.3
F5 BIG-IP SSL Orchestrator>=17.5.0<=17.5.1
F5 Big-ip Webaccelerator>=17.1.0<=17.1.3
F5 Big-ip Webaccelerator>=17.5.0<=17.5.1
F5 Big-ip Websafe>=17.1.0<=17.1.3
F5 Big-ip Websafe>=17.5.0<=17.5.1
F5 BIG-IP Access Policy Manager>=16.1.0<=16.1.6
F5 BIG-IP Advanced Firewall Manager>=16.1.0<=16.1.6
F5 Big-ip Advanced Web Application Firewall>=16.1.0<=16.1.6
F5 BIG-IP Analytics>=16.1.0<=16.1.6
F5 Big-ip Application Acceleration Manager>=16.1.0<=16.1.6
F5 BIG-IP Application Security Manager>=16.1.0<=16.1.6
F5 Big-ip Application Visibility And Reporting>=16.1.0<=16.1.6
F5 Big-ip Automation Toolchain>=16.1.0<=16.1.6
F5 Big-ip Carrier-grade Nat>=16.1.0<=16.1.6
F5 BIG-IP Container Ingress Services>=16.1.0<=16.1.6
F5 Big-ip Ddos Hybrid Defender>=16.1.0<=16.1.6
F5 Big-ip Domain Name System>=16.1.0<=16.1.6
F5 BIG-IP Edge Gateway>=16.1.0<=16.1.6
F5 Big-ip Fraud Protection Service>=16.1.0<=16.1.6
F5 Big-ip Global Traffic Manager>=16.1.0<=16.1.6
F5 Big-ip Link Controller>=16.1.0<=16.1.6
F5 Big-ip Local Traffic Manager>=16.1.0<=16.1.6
F5 Big-ip Policy Enforcement Manager>=16.1.0<=16.1.6
F5 BIG-IP SSL Orchestrator>=16.1.0<=16.1.6
F5 Big-ip Webaccelerator>=16.1.0<=16.1.6
F5 Big-ip Websafe>=16.1.0<=16.1.6
F5 BIG-IP Access Policy Manager=21.0.0
F5 BIG-IP Advanced Firewall Manager=21.0.0
F5 Big-ip Advanced Web Application Firewall=21.0.0
F5 BIG-IP Analytics=21.0.0
F5 Big-ip Application Acceleration Manager=21.0.0
F5 BIG-IP Application Security Manager=21.0.0
F5 Big-ip Application Visibility And Reporting=21.0.0
F5 Big-ip Automation Toolchain=21.0.0
F5 Big-ip Carrier-grade Nat=21.0.0
F5 BIG-IP Container Ingress Services=21.0.0
F5 Big-ip Ddos Hybrid Defender=21.0.0
F5 Big-ip Domain Name System=21.0.0
F5 BIG-IP Edge Gateway=21.0.0
F5 Big-ip Fraud Protection Service=21.0.0
F5 Big-ip Global Traffic Manager=21.0.0
F5 Big-ip Link Controller=21.0.0
F5 Big-ip Local Traffic Manager=21.0.0
F5 Big-ip Policy Enforcement Manager=21.0.0
F5 BIG-IP SSL Orchestrator=21.0.0
F5 Big-ip Webaccelerator=21.0.0
F5 Big-ip Websafe=21.0.0
Event History
May 13, 2026
CVE Published
via MITRE·02:12 PM
Data Sourced
via MITRE·02:12 PM
DescriptionSeverityWeakness
Data Sourced
via NVD·04:16 PM
DescriptionSeverityWeaknessAffected Software
Frequently Asked Questions
1
What is the severity of CVE-2026-39459?
CVE-2026-39459 is classified as a high severity vulnerability due to its potential for arbitrary command execution by authenticated attackers.
2
How do I fix CVE-2026-39459?
To fix CVE-2026-39459, you should apply the latest patches and updates provided by F5 for the affected products.
3
Who is affected by CVE-2026-39459?
CVE-2026-39459 affects users of F5 BIG-IP iControl REST and the TMOS Shell (tmsh) who have the Manager role or higher.
4
What actions can an attacker take with CVE-2026-39459?
An attacker exploiting CVE-2026-39459 can create configuration objects that allow them to execute arbitrary commands on the system.
5
Is there a workaround for CVE-2026-39459?
Currently, the best approach to mitigate CVE-2026-39459 is to limit access to highly privileged accounts until the vulnerability can be patched.