Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-66033

Libssh2 Vulnerability in NetApp Products

CVE-2026-66033: Libssh2 Vulnerability in NetApp Products. Not in the CISA KEV catalog. High advisory severity (CVSS 8.7, 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-2026-66033 key facts

CISA KEV: Not listed (catalog checked Nov 6, 2026)
Highest advisory severity: High
CVSS base score: 8.7 (NetApp), 6.5 (Red Hat)
CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H (Red Hat)
Weakness: CWE-125
Fixed releases: Red Hat: 1.11.1, libssh2-main-1.11.1-10.2.hum1, RHSA-2026:46927
Vendor advisories: 2 from NetApp, Red Hat
VulniPulse record: Published Jul 28, 2026 · Updated Oct 5, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-66033; bulletin-wide values are not repeated here.

Is CVE-2026-66033 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-66033 is not in the CISA KEV catalog (checked Nov 6, 2026) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-66033?

Upgrade to a fixed release named by the vendor:

Red Hat: 1.11.1, libssh2-main-1.11.1-10.2.hum1, RHSA-2026:46927

To mitigate the vulnerability, developers or administrators must configure the specific applications utilizing libssh2 to explicitly exclude AES-GCM from their preferred cipher lists. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory

Advisory severityHigh8.7
High [CVE-2026-66033] Libssh2 Vulnerability in NetApp Products
NTAP-20260807-0002Source published Aug 7, 2026Source updated Oct 5, 2026
Libssh2 versions through 1.11.1 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: Active IQ Unified Manager for VMware vSphere, ONTAP Select Deploy administration utility. 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
Active IQ Unified Manager for VMware vSphere
ONTAP Select Deploy administration utility
Source-reported affected versions
1.11.1
Source-reported fixed versions
No fixed-version detail extracted. This does not mean no fix exists.
Mitigation guidance
No mitigation guidance extracted; consult the source.
Full advisory and evidence Open source bulletin

Red Hat

1 advisory

Advisory severityMedium6.5
Medium [CVE-2026-66033] Denial of Service via integer underflow in AES-GCM cipher negotiation
CVE-2026-66033Source published Jul 24, 2026Source updated Jul 24, 2026
libssh2 through 1.11.1, fixed in commit a2ed82d, contains a pre-authentication integer underflow vulnerability in the ssh2_cipher_crypt() function in src/openssl.c that allows a malicious SSH server to crash any connecting client by negotiating AES-GCM ciphers during handshake. Attackers can exploit the underflow in the expression computing blocksize minus aadlen minus authentication tag length to trigger an out-of-bounds read and a memcpy call with a near-SIZE_MAX length argument, causing immediate process crash before any authentication occurs. A flaw was found in libssh2. A malicious SSH server can exploit this to trigger an out-of-bounds read and a memory copy operation with an extremely large length argument, leading to an immediate client process crash. This vulnerability results…
Affected products in this advisory
Red Hat Hardened Images
Red Hat Enterprise Linux 6
Red Hat package: libssh2
Source-reported affected versions
Affected-version details not available in this record.
Source-reported fixed versions
1.11.1
libssh2-main-1.11.1-10.2.hum1
RHSA-2026:46927
Mitigation guidance
To mitigate the vulnerability, developers or administrators must configure the specific applications utilizing libssh2 to explicitly exclude AES-GCM from their preferred cipher lists.
Full advisory and evidence Open source bulletin

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