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NTAP-20260924-0020 — CVE-2026-56409 Libexpat Vulnerability in NetApp Products
Published 2026-09-24 · Updated 2026-09-25 · Status: Interim · Exploitation: Public · Severity: MEDIUM 6.5 · ONTAP affected: Yes
Official advisory: NTAP-20260924-0020 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: 6.5
CVEs in this advisory
- CVE-2026-56409 — MEDIUM · CVSS 6.5 · site index
What the CVE records say
CVE-2026-56409 — xmlwf in libexpat before 2.8.2 has an integer overflow for the output filename when -d outputDir is used.
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
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.
Related reading
- Common ONTAP problems (FAQ) — plain-language symptoms and fixes
- ONTAP security hardening — baseline lockdown guidance
- Ransomware protection on ONTAP — SnapLock, SnapMirror vaulting, Anomaly Detection
- ONTAP error messages index — EMS/WAFL/NFS/SnapMirror messages
- Every NetApp advisory published in 2026