CVE-2026-59762

BIG-IP HTTP/2 vulnerability

State: Published
Severity: 8.7 High
Published: Jul 15, 2026
Updated: Jul 15, 2026
Reserved: Jul 8, 2026

Description

When an HTTP/2 profile is configured on a virtual server, undisclosed requests can cause an increase in memory resource utilization.

Impact: System performance can degrade until the TMM process is either forced to restart or is manually restarted. This vulnerability allows a remote, unauthenticated attacker to cause a degradation of service that can lead to a denial-of-service (DoS) on the BIG-IP system. There is no control plane exposure; this is a data plane issue only.

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-770 Allocation of Resources Without Limits or Throttling

Affected Products

Product	Versions
BIG-IPF5	21.1.0 to before 21.1.0.1Affected 21.0.0 to before 21.0.0.3Affected 17.5.0 to before 17.5.1.8Affected 17.1.0 to before 17.1.3.4Affected
BIG-IP Next for KubernetesF5	2.3.0 to before 2.3.2Affected 2.0.0 to before 2.2.3Affected
BIG-IP Next SPKF5	1.9.0 and laterAffected 1.7.0 to before 1.7.18Affected
BIG-IP Next CNFF5	2.3.0 to before 2.3.2Affected 2.0.0 to before 2.2.3Affected 1.1.0 to before 1.4.3Affected

References

https://my.f5.com/manage/s/article/K000162231vendor-advisorypatch

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