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NTAP-20251224-0008 — CVE-2025-66418 Urllib3 Vulnerability in NetApp Products

Published 2025-12-24 · Updated 2026-09-23 · Status: Interim · Exploitation: Public · Severity: HIGH 7.5 · ONTAP affected: Yes

Official advisory: NTAP-20251224-0008 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Active IQ Unified Manager · SolidFire / NetApp HCI · Other NetApp products · ONTAP · NetApp Console / BlueXP | ONTAP-relevant | highest CVSS: 7.5

CVEs in this advisory

CVE-2025-66418 — HIGH · CVSS 7.5 · site index

What the CVE records say

CVE-2025-66418 — urllib3 is a user-friendly HTTP client library for Python. Starting in version 1.24 and prior to 2.6.0, the number of links in the decompression chain was unbounded allowing a malicious server to insert a virtually unlimited number of compression steps leading to high CPU usage and massive memory allocation for the decompressed data. This vulnerability is fixed in 2.6.0.

Impact

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

Affected products

Active IQ Unified Manager for VMware vSphere
Management Services for Element Software and NetApp HCI
NetApp Data Classification
ONTAP Select Deploy administration utility
Active IQ Config Advisor
Active IQ OneCollect
FAS/AFF BIOS - A900/9500
NetApp Console Agent OVA
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node (Element Software)
NetApp XCP NFS
NetApp XCP SMB

Official fixes

NetApp Data Classification — vendor fix ↗

References

https://nvd.nist.gov/vuln/detail/CVE-2025-66418 ↗

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.