CVE-2026-39458 — HIGH (7.5)

Vulnerability Description

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.

CVSS Score

7.5

HIGH

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

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Related Weaknesses (CWE)

CWE-824

References

https://my.f5.com/manage/s/article/K000160945

FAQ

What is CVE-2026-39458?

CVE-2026-39458 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 ...

How severe is CVE-2026-39458?

CVE-2026-39458 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2026-39458?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.