CVE-2026-42408 BIG-IP DNS tmsh vulnerability
A highly privileged authenticated attacker can view sensitive information via an undisclosed tmsh command in BIG-IP DNS.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-42408?
CVE-2026-42408 is a medium-severity vulnerability in F5 Big-Ip Access Policy Manager, published on 13 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
When BIG-IP DNS is provisioned, a vulnerability exists in an undisclosed TMOS Shell (tmsh) command that may allow a highly privileged authenticated attacker to view sensitive information. Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.
Weakness: CWE-312
Which versions are affected by CVE-2026-42408?
It affects 21 products.
Products include F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Advanced Web Application Firewall, F5 Big-Ip Analytics, F5 Big-Ip Application Acceleration Manager, F5 Big-Ip Application Security Manager and 15 more.
How do I fix CVE-2026-42408?
No fix has been published for CVE-2026-42408 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-42408 being exploited?
There is no known exploitation of CVE-2026-42408 in the wild and no public exploit code.
Other vulnerabilities in F5 Big-Ip Access Policy Manager
- CVE-2023-46747 F5 BIG-IP Configuration Utility Authentication Bypass
- CVE-2022-1388 F5 BIG-IP Missing Authentication
- CVE-2021-22986 F5 BIG-IP and BIG-IQ Centralized Management iControl REST Remote Code Execution
- CVE-2021-22991 F5 BIG-IP Traffic Management Microkernel Buffer Overflow
- CVE-2020-5902 F5 BIG-IP Traffic Management User Interface (TMUI) Remote Code Execution
Sources
Also known as GHSA-5jw2-vqxm-5fmx.