CVE-2026-59762 PUBLISHED

BIG-IP HTTP/2 vulnerability

Assigner: f5
Reserved: 08.07.2026 Published: 15.07.2026 Updated: 15.07.2026

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.

Metrics

CVSS Vector: 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
CVSS Score: 8.7

Standard Deployment

Product Status

Vendor F5
Product BIG-IP
Versions Default: unknown
  • affected from 21.1.0 to 21.1.0.1 (excl.)
  • affected from 21.0.0 to 21.0.0.3 (excl.)
  • affected from 17.5.0 to 17.5.1.8 (excl.)
  • affected from 17.1.0 to 17.1.3.4 (excl.)
Vendor F5
Product BIG-IP Next for Kubernetes
Versions Default: unknown
  • affected from 2.3.0 to 2.3.2 (excl.)
  • affected from 2.0.0 to 2.2.3 (excl.)
Vendor F5
Product BIG-IP Next SPK
Versions Default: unknown
  • affected from 1.9.0 to * (excl.)
  • affected from 1.7.0 to 1.7.18 (excl.)
Vendor F5
Product BIG-IP Next CNF
Versions Default: unknown
  • affected from 2.3.0 to 2.3.2 (excl.)
  • affected from 2.0.0 to 2.2.3 (excl.)
  • affected from 1.1.0 to 1.4.3 (excl.)

Credits

  • F5 acknowledges the Okta Red Team of Okta for bringing this issue to our attention and following the highest standards of coordinated disclosure. reporter

References

Problem Types

  • CWE-770: Allocation of Resources Without Limits or Throttling CWE