Stack-based buffer overflow in F5 Networks products - CVE-2026-41956
Published: May 14, 2026
Vulnerability identifier: #VU131416
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-41956
CWE-ID: CWE-121
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to stack-based buffer overflow in the Traffic Management Microkernel (TMM) classification handling on a UDP virtual server when processing undisclosed requests. A remote attacker can send crafted requests to cause a denial of service.
Only the data plane is exposed; there is no control plane exposure. Exploitation requires a classification profile to be configured on a UDP virtual server.
Affected software
BIG-IP Next CNF
BIG-IP Next for Kubernetes
BIG-IP
BIG-IP Next for Kubernetes
BIG-IP
How to mitigate CVE-2026-41956
Install security update from vendor's website.
BIG-IP Next CNF - addressed in versions 1.4.1, 2.0.3, 2.1.0
BIG-IP Next for Kubernetes - update to 2.1.0
BIG-IP - addressed in versions 17.1.3.1, 17.5.1.4
BIG-IP Next for Kubernetes - update to 2.1.0
BIG-IP - addressed in versions 17.1.3.1, 17.5.1.4