HTTP/2 Unauth DoS in F5 BIG-IP Virtual Server
CVE-2026-59762 Published on July 15, 2026
BIG-IP HTTP/2 vulnerability
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.
Vulnerability Analysis
CVE-2026-59762 is exploitable with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity, and a high impact on availability.
Weakness Type
Allocation of Resources Without Limits or Throttling
The software allocates a reusable resource or group of resources on behalf of an actor without imposing any restrictions on the size or number of resources that can be allocated, in violation of the intended security policy for that actor.
Products Associated with CVE-2026-59762
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Affected Versions
F5 BIG-IP:- Version 21.1.0 and below 21.1.0.1 is affected.
- Version 21.0.0 and below 21.0.0.3 is affected.
- Version 17.5.0 and below 17.5.1.8 is affected.
- Version 17.1.0 and below 17.1.3.4 is affected.
- Version 2.3.0 and below 2.3.2 is affected.
- Version 2.0.0 and below 2.2.3 is affected.
- Version 1.9.0 and below * is affected.
- Version 1.7.0 and below 1.7.18 is affected.
- Version 2.3.0 and below 2.3.2 is affected.
- Version 2.0.0 and below 2.2.3 is affected.
- Version 1.1.0 and below 1.4.3 is affected.