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NTAP-20260925-0027 — CVE-2026-58055 Nghttp2 Vulnerability in NetApp Products

Published 2026-09-25 · Updated 2026-09-25 · Status: Interim · Exploitation: Public · Severity: MEDIUM 5.4 · ONTAP affected: Yes

Official advisory: NTAP-20260925-0027 on security.netapp.com ↗. Affected versions, fixed releases, and workarounds live there — this page is a summary.

Product family: Active IQ Unified Manager · ONTAP · NetApp Console / BlueXP · SolidFire / NetApp HCI · SnapCenter | ONTAP-relevant | highest CVSS: 5.4

CVEs in this advisory

CVE-2026-58055 — MEDIUM · CVSS 5.4 · site index

What the CVE records say

CVE-2026-58055 — nghttp2's nghttpx proxy through 1.69.0 forwards an HTTP/1.1 Upgrade request that also carries a Content-Length header and body onto reusable keep-alive backend connections, re-adding the Upgrade and Connection headers while passing Content-Length verbatim. A backend that resolves the resulting ambiguous message in the attacker's favor enables HTTP request/response smuggling and cross-client response-queue poisoning.

Impact

Successful exploitation of this vulnerability could lead to disclosure of sensitive information or addition or modification of data.

Affected products

Active IQ Unified Manager for VMware vSphere
Cloud Volumes ONTAP Mediator
NetApp Console Agent Container (mysql)
NetApp Console Agent OVA
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node (Element Software)
ONTAP Select Deploy administration utility
SnapCenter Plug-in for VMware vSphere

References

https://www.vulncheck.com/advisories/nghttp2-nghttpx-http-request-response-smuggling-via-upgrade-req ↗

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.