Main Vulnerability Database Vulnerabilities #VU131396

Allocation of Resources Without Limits or Throttling in F5 Networks products - CVE-2026-40629

Published: May 14, 2026

Vulnerability identifier: #VU131396

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-2026-40629

CWE-ID: CWE-770

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 allocation of resources without limits or throttling in a virtual server configured with a client SSL profile when processing undisclosed traffic. A remote attacker can send undisclosed traffic to cause a denial of service.

Only new client connections to the impacted virtual server are disrupted. There is no control plane exposure; this is a data plane issue only.

Affected software

BIG-IP Next CNF
BIG-IP Next SPK
BIG-IP Next for Kubernetes
BIG-IP

How to mitigate CVE-2026-40629

Install security update from vendor's website.

BIG-IP Next CNF - addressed in versions 1.4.1, 2.0.3
BIG-IP Next SPK - addressed in versions 1.7.16, 2.0.3
BIG-IP Next for Kubernetes - update to 2.1.1
BIG-IP - addressed in versions 17.1.3.1, 17.5.1.4

External References

https://my.f5.com/manage/s/article/K000158978

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