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NTAP-20260924-0023 — CVE-2026-56131 Libexpat Vulnerability in NetApp Products

Published 2026-09-24 · Updated 2026-09-25 · Status: Interim · Exploitation: Public · Severity: MEDIUM 4.9 · ONTAP affected: Yes

Official advisory: NTAP-20260924-0023 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: SolidFire / NetApp HCI · Baseboard management controllers · Active IQ Unified Manager · ONTAP · Other NetApp products · NetApp Console / BlueXP · SnapCenter | ONTAP-relevant | highest CVSS: 4.9

CVEs in this advisory

CVE-2026-56131 — MEDIUM · CVSS 4.9 · site index

What the CVE records say

CVE-2026-56131 — libexpat before 2.8.2 lacks handler call depth tracking for calls to XML_ResumeParser from within handlers in cases of a policy violation. Thus, a use-after-free can occur (similar to the CVE-2026-50219 situation).

Impact

Successful exploitation of this vulnerability could lead to disclosure of sensitive information, addition or modification of data or Denial of Service (DoS).

Affected products

NetApp HCI Baseboard Management Controller (BMC) - H610S
AFF/ASA/FAS Baseboard Management Controller (BMC) - A1K/A90/A70/C80/FAS90/FAS70
AFF/ASA/FAS Baseboard Management Controller (BMC) - A50/A30/A20/C60/C30/FAS50
Active IQ Unified Manager for VMware vSphere
Cloud Volumes ONTAP Mediator
FAS/AFF BIOS - A900/9500
FAS/AFF Baseboard Management Controller (BMC) - A320
FAS/AFF Baseboard Management Controller (BMC) - A800/C800
FAS/AFF Baseboard Management Controller (BMC) - A900/9500
FAS/AFF Baseboard Management Controller (BMC) - C190/A150/A220/FAS2720/FAS2750
FAS/AFF Baseboard Management Controller (BMC) - FAS2820
FAS/AFF Service Processor - A300/8200

References

https://nvd.nist.gov/vuln/detail/CVE-2026-56131 ↗

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.