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NTAP-20260930-0009 — CVE-2026-81736 ISC BIND Vulnerability in NetApp Products

Published 2026-09-30 · Updated 2026-10-02 · Status: Interim · Exploitation: Public · Severity: HIGH 7.5 · ONTAP affected: Yes

Official advisory: NTAP-20260930-0009 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Active IQ Unified Manager · Brocade SAN firmware · ONTAP · Other NetApp products · Baseboard management controllers · SolidFire / NetApp HCI · SnapCenter | ONTAP-relevant | highest CVSS: 7.5

CVEs in this advisory

CVE-2026-81736 — HIGH · CVSS 7.5 · site index

What the CVE records say

CVE-2026-81736 — If a BIND resolver has cached a tree of SVCB/HTTPS AliasMode records, and is then queried for the root of that tree, the resolver will spend disproportionate CPU time constructing the response. This issue affects BIND 9 versions 9.18.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.18.11-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

Impact

Successful exploitation of this vulnerability could lead to Denial of Service (DoS).

Affected products

Active IQ Unified Manager for VMware vSphere
Brocade SAN Navigator (SANnav)
Cloud Volumes ONTAP Mediator
FAS/AFF BIOS - A900/9500
FAS/AFF Baseboard Management Controller (BMC) - A250/500f/C250
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node (Element Software)
SnapCenter Plug-in for VMware vSphere

References

https://kb.isc.org/docs/cve-2026-81736 ↗

What to do

Check the affected products listed above against the official advisory's affected-versions table — that is where the exact ONTAP 9 release, ONTAP tool, or management product versions are named.
If affected and a fixed release exists, plan the upgrade — see the ONTAP upgrade runbook.
If exploitation is listed as "active", treat remediation as urgent and review exposure (management LIFs, ONTAP S3, SnapMirror endpoints).
Harden in parallel: security hardening baseline and ransomware protection on ONTAP.