Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-21441

Urllib3 Vulnerability in NetApp Products

CVE-2026-21441: Urllib3 Vulnerability in NetApp Products. Not in the CISA KEV catalog. High advisory severity (CVSS 8.9, NetApp).

Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.

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CVE-2026-21441 key facts

CISA KEV: Not listed (catalog checked Oct 30, 2026)
Highest advisory severity: High
CVSS base score: 8.9 (NetApp), 7.5 (Red Hat)
Weakness: CWE-409
Fixed releases: NetApp: NetApp Data Classification: 1.52.0
Red Hat: RHSA-2026:2456
Vendor advisories: 2 from NetApp, Red Hat
VulniPulse record: Published Jan 7, 2026 · Updated Sep 21, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-21441; bulletin-wide values are not repeated here.

Is CVE-2026-21441 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-21441 is not in the CISA KEV catalog (checked Oct 30, 2026) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-21441?

Upgrade to a fixed release named by the vendor:

NetApp: NetApp Data Classification: 1.52.0
Red Hat: RHSA-2026:2456

Update affected NetApp products to a fixed release: NetApp Data Classification: 1.52.0. (NetApp)
Update the affected package(s) to the fixed version shipped in RHSA-2026:2456 (`sudo dnf update` / `yum update`). (Red Hat)

Vendor advisory comparison

NetApp

1 advisory

Advisory severityHigh8.9
High [CVE-2026-21441] Urllib3 Vulnerability in NetApp Products
NTAP-20260130-0010Source published Jan 30, 2026Source updated Sep 21, 2026
Multiple NetApp products incorporate Urllib3. Urllib3 versions 1.22 prior to 2.6.3 are susceptible to a vulnerability which when successfully exploited could lead to Denial of Service (DoS). Successful exploitation of this vulnerability could lead to Denial of Service (DoS). Affected products: Management Services for Element Software and NetApp HCI, NetApp Data Classification. NetApp reports that one or more additional products remain under investigation; review the canonical advisory for current status. NetApp states there is no workaround available at this time.
Affected products in this advisory
Management Services for Element Software and NetApp HCI
NetApp Data Classification
Source-reported affected versions
1.22
2.6.3
Source-reported fixed versions
NetApp Data Classification: 1.52.0
Mitigation guidance
Update affected NetApp products to a fixed release: NetApp Data Classification: 1.52.0.
Full advisory and evidence Open source bulletin

Red Hat

1 advisory

Advisory severityHigh7.5
High [CVE-2026-21441] urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)
CVE-2026-21441Source published Jan 7, 2026
urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API). Red Hat rates this important (CVSS 7.5). Weakness: CWE-409. Affected package(s): rhacm2/submariner-globalnet-rhel9:1774550347, oadp/oadp-velero-rhel9:1770421082, rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9:1771502845, rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9:1770103255, python3.12-urllib3, rhoai/odh-workbench-jupyter-tensorflow-cuda-py312-rhel9:1771502910. Resolved in Red Hat advisory RHSA-2026:2456 — update the affected packages (`sudo dnf update`).
Affected products in this advisory
Red Hat Enterprise Linux 10.0 Extended Update Support
Red Hat Enterprise Linux 7 Extended Lifecycle Support
Red Hat Enterprise Linux 8.2 Advanced Update Support
Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support
72 more entries in the full advisory.
Source-reported affected versions
rhacm2/submariner-globalnet-rhel9:1774550347
oadp/oadp-velero-rhel9:1770421082
rhoai/odh-workbench-jupyter-pytorch-cuda-py312-rhel9:1771502845
rhoai/odh-pipeline-runtime-minimal-cpu-py312-rhel9:1770103255
8 more entries in the full advisory.
Source-reported fixed versions
RHSA-2026:2456
Mitigation guidance
Update the affected package(s) to the fixed version shipped in RHSA-2026:2456 (`sudo dnf update` / `yum update`).
Full advisory and evidence Open source bulletin

All NetApp advisories

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