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HIGH · 7.5

CVE-2026-42409

When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) p...

Vulnerability Description

When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) process to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
NONE
Integrity
NONE
Availability
HIGH

Affected Products

VendorProductVersions
F5Big-Ip Next Cloud-Native Network Functions>= 1.1.0, <= 1.4.0
F5Big-Ip Next For Kubernetes>= 2.0.0, <= 2.1.0
F5Big-Ip Access Policy Manager21.0.0
F5Big-Ip Advanced Firewall Manager21.0.0
F5Big-Ip Advanced Web Application Firewall21.0.0
F5Big-Ip Analytics21.0.0
F5Big-Ip Application Acceleration Manager21.0.0
F5Big-Ip Application Security Manager21.0.0
F5Big-Ip Application Visibility And Reporting21.0.0
F5Big-Ip Automation Toolchain21.0.0
F5Big-Ip Carrier-Grade Nat21.0.0
F5Big-Ip Container Ingress Services21.0.0
F5Big-Ip Ddos Hybrid Defender21.0.0
F5Big-Ip Domain Name System21.0.0
F5Big-Ip Edge Gateway21.0.0
F5Big-Ip Fraud Protection Service21.0.0
F5Big-Ip Global Traffic Manager21.0.0
F5Big-Ip Link Controller21.0.0
F5Big-Ip Local Traffic Manager21.0.0
F5Big-Ip Policy Enforcement Manager21.0.0

Related Weaknesses (CWE)

CWE-476

References

FAQ

What is CVE-2026-42409?

CVE-2026-42409 is a vulnerability with a CVSS score of 7.5 (HIGH). When an HTTP/2 profile and an iRule containing the HTTP::redirect or HTTP::respond command are configured on a virtual server, undisclosed requests can cause the Traffic Management Microkernel (TMM) p...

How severe is CVE-2026-42409?

CVE-2026-42409 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-42409?

Check the references section above for vendor advisories and patch information. Affected products include: F5 Big-Ip Next Cloud-Native Network Functions, F5 Big-Ip Next For Kubernetes, F5 Big-Ip Access Policy Manager, F5 Big-Ip Advanced Firewall Manager, F5 Big-Ip Advanced Web Application Firewall.