Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-66034

Libssh2 Vulnerability in NetApp Products

CVE-2026-66034: Libssh2 Vulnerability in NetApp Products. Not in the CISA KEV catalog. High advisory severity (CVSS 7.7, 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-2026-66034 key facts

CISA KEV: Not listed (catalog checked Nov 6, 2026)
Highest advisory severity: High
CVSS base score: 7.7 (NetApp), 5.9 (Red Hat)
CVSS vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:H (Red Hat)
Weakness: CWE-125
Fixed releases: Red Hat: 1.11.1, libssh2-0:1.8.0-4.el7_9.2, libssh2-main-1.11.1-10.2.hum1, RHSA-2026:61752, RHSA-2026:46927
Vendor advisories: 2 from NetApp, Red Hat
VulniPulse record: Published Jul 28, 2026 · Updated Oct 6, 2026

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-66034; bulletin-wide values are not repeated here.

Is CVE-2026-66034 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-66034 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-2026-66034?

Upgrade to a fixed release named by the vendor:

Red Hat: 1.11.1, libssh2-0:1.8.0-4.el7_9.2, libssh2-main-1.11.1-10.2.hum1, RHSA-2026:61752, RHSA-2026:46927

To mitigate this, strictly avoid connecting to untrusted SSH servers and enforce this policy using outbound network firewalls to block unknown IP addresses. For defense-in-depth, utilize OS-level memory protections and service sandboxing to contain any accidental exposure. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory

Advisory severityHigh7.7
High [CVE-2026-66034] Libssh2 Vulnerability in NetApp Products
NTAP-20260807-0003Source published Aug 7, 2026Source updated Oct 6, 2026
Libssh2 versions through 1.11.1 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information, addition or modification of data, or Denial of Service (DoS). 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
No product details extracted. Check the source bulletin.
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 severityMedium5.9
Medium [CVE-2026-66034] Information disclosure and potential arbitrary code execution via heap out-of-bounds read
CVE-2026-66034Source published Jul 24, 2026Source updated Jul 24, 2026
libssh2 through 1.11.1, fixed in commit a13bb6c, contains a missing bounds check vulnerability that allows a malicious SSH server to trigger an arbitrary-length heap out-of-bounds read and a free of an uninitialized pointer via the publickey subsystem. In libssh2_publickey_list_fetch(), the version 1 response parser reads a server-controlled comment_len value and advances the parse pointer without verifying sufficient bytes remain in the buffer, causing the out-of-bounds read to leak heap pointers from adjacent allocations defeating ASLR, followed by heap allocator state corruption when the error cleanup path frees an uninitialized pointer from a non-zeroed realloc() region. A missing bounds check in the libssh2 publickey subsystem allows malicious SSH servers to trigger a client-side…
Affected products in this advisory
Red Hat Enterprise Linux 7 Extended Lifecycle Support
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
libssh2-0:1.8.0-4.el7_9.2
libssh2-main-1.11.1-10.2.hum1
RHSA-2026:61752
1 more entries in the full advisory.
Mitigation guidance
To mitigate this, strictly avoid connecting to untrusted SSH servers and enforce this policy using outbound network firewalls to block unknown IP addresses. For defense-in-depth, utilize OS-level memory protections and service sandboxing to contain any accidental exposure.
Full advisory and evidence Open source bulletin

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