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NTAP-20261006-0020 — CVE-2025-25186 net-imap Vulnerability in NetApp Products

Published 2026-10-06 · Updated 2026-10-06 · Status: Interim · Exploitation: Public · Severity: MEDIUM 6.5 · ONTAP affected: Yes

Official advisory: NTAP-20261006-0020 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: ONTAP | ONTAP-relevant | highest CVSS: 6.5

CVEs in this advisory

CVE-2025-25186 — MEDIUM · CVSS 6.5 · site index

What the CVE records say

CVE-2025-25186 — Net::IMAP implements Internet Message Access Protocol (IMAP) client functionality in Ruby. Starting in version 0.3.2 and prior to versions 0.3.8, 0.4.19, and 0.5.6, there is a possibility for denial of service by memory exhaustion in `net-imap`'s response parser. At any time while the client is connected, a malicious server can send can send highly compressed `uid-set` data which is automatically read by the client's receiver thread. The response parser uses `Range#to_a` to convert the `uid-set` data into arrays of integers, with no limitation on the expanded size of the ranges. Versions 0.3.8, 0.4.19, 0.5.6, and higher fix this issue. Additional details for proper configuration of fixed versions and backward compatibility are available in the GitHub Security Advisory.

Impact

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

Affected products

ONTAP tools for VMware vSphere 10

References

https://github.com/ruby/net-imap/security/advisories/GHSA-7fc5-f82f-cx69 ↗

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.