High 7.5Published May 13, 2026

CVE-2026-39458BIG-IP DNS Cache vulnerability

Updated under an hour ago (Oct 26, 2026, 4:20 PM ET)

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It affects F5 BIG-IP and 21 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for F5 BIG-IP

Exploited in the last 30 days

When a BIG-IP is configured with DNS caching (Such as a DNS profile with caching enabled, SSL Orchestrator, Advanced WAF DoS protection), 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: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-824
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: f5
NVD analysis: Modified
Record last updated: Aug 24, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

F5 BIG-IP f5:big_ip (from the name)	from 21.1.0 not affected; from 21.0.0 before 21.0.0.1; from 17.5.0 before 17.5.1.6; from 17.1.0 before 17.1.3.2; from 16.1.0	CNA record
f5 big-ip_access_policy_manager f5:big-ip_access_policy_manager	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_advanced_firewall_manager f5:big-ip_advanced_firewall_manager	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_advanced_web_application_firewall f5:big-ip_advanced_web_application_firewall	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_analytics f5:big-ip_analytics	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_application_acceleration_manager f5:big-ip_application_acceleration_manager	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_application_security_manager f5:big-ip_application_security_manager	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_application_visibility_and_reporting f5:big-ip_application_visibility_and_reporting	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_automation_toolchain f5:big-ip_automation_toolchain	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
f5 big-ip_carrier-grade_nat f5:big-ip_carrier-grade_nat	from 17.1.0 through 17.1.3; from 17.5.0 through 17.5.1; from 16.1.0 through 16.1.6; 21.0.0	NVD
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References

References

https://my.f5.com/manage/s/article/K000160945	vendor-advisory, patch, mitigation

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.