Stack-based buffer overflow in BIG-IP - CVE-2026-42919
Published: May 14, 2026
Vulnerability identifier: #VU131414
CSH Severity: Low
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:H/VA:H/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2026-42919
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: F5 Networks
Affected software:
BIG-IP
BIG-IP
Detailed vulnerability description
The vulnerability allows a remote user to escalate privileges.
The vulnerability exists due to stack-based buffer overflow in BIG-IP external monitors when handling administrative access to Appliance mode functionality. A remote privileged user can execute arbitrary system commands to escalate privileges.
This is a control plane issue only and there is no data plane exposure.
How to mitigate CVE-2026-42919
Install security update from vendor's website.