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NTAP-20260703-0020 — CVE-2026-55200 Libssh2 Vulnerability in NetApp Products

Published 2026-07-03 · Updated 2026-09-14 · Status: Interim · Exploitation: Public · Severity: HIGH 8.1 · ONTAP affected: Yes

Official advisory: NTAP-20260703-0020 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Active IQ Unified Manager · ONTAP · Other NetApp products · SolidFire / NetApp HCI | ONTAP-relevant | highest CVSS: 8.1

CVEs in this advisory

CVE-2026-55200 — HIGH · CVSS 8.1 · site index

What the CVE records say

CVE-2026-55200 — libssh2 through 1.11.1, fixed in commit 7acf3df contains an out-of-bounds write vulnerability in ssh2_transport_read() that fails to enforce upper bounds on packet_length field. Remote attackers can send crafted SSH packets with excessively large packet_length values to corrupt heap memory and achieve remote code execution.

Impact

Successful exploitation of this vulnerability could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). <br><br> Cloud Volumes ONTAP Mediator: Affected versions 9.17.1P4 through 9.17.1P9, 9.18.1P1 through 9.18.1P5 and 9.19.1GA through 9.19.1P1.

Affected products

Active IQ Unified Manager for VMware vSphere
Cloud Volumes ONTAP Mediator
ONTAP Select Deploy administration utility
FAS/AFF BIOS - A900/9500
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node (Element Software)

References

https://www.vulncheck.com/advisories/libssh2-out-of-bounds-write-via-unchecked-packet-length-in-tran ↗

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.