High severity7.5NVD Advisory· Published Jul 15, 2026· Updated Aug 6, 2026

CVE-2026-59762

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.

Affected products

F5, Inc./Big IPllm-fuzzy

Patches

Vulnerability mechanics

References

my.f5.com/manage/s/article/K000162231nvdVendor Advisory

News mentions

Weekly Cyber Security Newsletter Bulletin – Certighost Exploit, Checkpoint 0-day, HTTP/2 Flaw, Notepad++ Plugin Abuse +20 Stories
Cyber Security News · Jul 26, 2026
New HTTP/2 Vulnerability Lets Hackers Crash Servers With Memory Exhaustion Attacks
Cyber Security News · Jul 24, 2026

Severity

HighCVSS v3.1

7.5/ 10

CVSS v48.7

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Attack vector: Network
Complexity: Low
Privileges: None
User interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: High

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS

Probability of exploitation in the next 30 days.

0.57%

VYPR risk score

Composite of severity, exploitation, and reach.

0.49medium

cvss	0.488
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000

Weaknesses

CWE-770
Allocation of Resources Without Limits or Throttling

CVE ID

CVE-2026-59762

Credits

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