CVE-2026-42409

BIG-IP HTTP/2 vulnerability

State: Published
Severity: 8.7 High
Published: May 13, 2026
Updated: May 13, 2026
Reserved: Apr 30, 2026

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.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	f5
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	f5

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
BIG-IPF5	21.1.0 and laterNot affected 21.0.0 to before 21.0.0.1Affected 17.5.0 to before 17.5.1.4Affected 17.1.0 to before 17.1.3.1Affected 16.1.0 and laterAffected
BIG-IP Next SPKF5	2.0.0 to before 2.0.3Affected 1.7.0 to before 1.7.17Affected
BIG-IP Next CNFF5	2.0.0 to before 2.0.3Affected 1.4.0 to before 1.4.1Affected
BIG-IP Next for KubernetesF5	2.0.0 to before 2.1.1Affected

References

https://my.f5.com/manage/s/article/K000159034vendor-advisorypatch

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