---
id: CVE-2026-39458
title: "When a BIG-IP DNS profile enabled with DNS cache is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.\_ Note: Software versions which have reached End of Technical Support…"
summary: "When a BIG-IP DNS profile enabled with DNS cache is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.\_ Note: Software versions which have reached End of Technical Support…"
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-824
published: '2026-05-13'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-39458'
references:
  - url: 'https://my.f5.com/manage/s/article/K000160945'
    label: f5sirt@f5.com
tags:
  - nvd
epss: 0.00263
epssPercentile: 0.18448
ingestedAt: '2026-06-29T14:29:18.086Z'
---

## Overview

When a BIG-IP DNS profile enabled with DNS cache is configured on a virtual server, undisclosed traffic can cause the Traffic Management Microkernel (TMM) to terminate.  Note: Software versions which have reached End of Technical Support (EoTS) are not evaluated.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.