CVE-2026-42409

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-05-13 16:16 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-10-26 14:10 UTC Last updatedMost recent change to the record

Details

Published

2026-05-13 16:16 UTC

Last modified

2026-10-26 14:10 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-476 · NULL pointer dereference

Record status

Analyzed

Affected

• f5 big-ip Next cloud-native Network Functions ≤ 1.4.0
• f5 big-ip Next cloud-native Network Functions ≤ 2.0.2
• f5 big-ip Next For Kubernetes ≤ 2.1.0
• f5 big-ip Access Policy Manager 21.0.0
• f5 big-ip Advanced Firewall Manager 21.0.0
• f5 big-ip Advanced Web Application Firewall 21.0.0
• f5 big-ip Analytics 21.0.0
• f5 big-ip Application Acceleration Manager 21.0.0

Attack profile CVSS 4.0 · 8.7

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High