Skip to content
VulniPulse
Sign in
Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-66035

Libssh2 Vulnerability in NetApp Products

CVE-2026-66035: 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.

NVD detail CVE.org

Get an email when NetApp publishes the next one.

See NetApp's last 90 days of advisories first. Then choose one product with live alerts free for life, or a free month of real-time alerts on everything with the severity, the fixed version and the vendor's link (card needed, then US$15/month; we email you before the first charge).

Alert me about NetApp

CVE-2026-66035 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
High
CVSS base score
7.7 (NetApp), 5.3 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:H (Red Hat)
Weakness
CWE-120
Fixed releases
  • Red Hat: 1.11.1, libssh2-main-1.11.1-10.3.hum1, RHSA-2026:46955
Vendor advisories
2 from NetApp, Red Hat
VulniPulse record
Published · Updated

Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-66035; bulletin-wide values are not repeated here.

Is CVE-2026-66035 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-66035 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.

How do I fix CVE-2026-66035?

Upgrade to a fixed release named by the vendor:

  • Red Hat: 1.11.1, libssh2-main-1.11.1-10.3.hum1, RHSA-2026:46955
  • To reduce exposure, restrict SSH client connections to only trusted and verified SSH servers. Avoid initiating SSH connections to unknown or unverified hosts, as successful exploitation requires the client to connect to a malicious server. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory
  • Advisory severityHigh7.7

    High [CVE-2026-66035] Libssh2 Vulnerability in NetApp Products

    NTAP-20260807-0004Source published Source updated

    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 evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityMedium5.3

    Medium [CVE-2026-66035] Arbitrary code execution via heap buffer overflow during SSH negotiation

    CVE-2026-66035Source published Source updated

    libssh2 through 1.11.1, fixed in commit 42e33d8, contains a pre-authentication heap buffer overflow vulnerability that allows a malicious SSH server to corrupt heap metadata in any connecting client by sending a packet with a packet_length smaller than the cipher's block size during Encrypt-then-MAC cipher negotiation. In the fullpacket() function in src/transport.c, the ETM path allocates a buffer of packet_length bytes but copies blocksize minus one bytes via memcpy, causing an overflow that on 32-bit glibc writes attacker-controlled bytes into an adjacent chunk's SIZE field, enabling tcache bin confusion, overlapping live objects, and function pointer overwrite during the session handshake before authentication. A flaw was found in libssh2. This allows the server to corrupt heap…

    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-1.11.1-10.3.hum1
    • RHSA-2026:46955
    Mitigation guidance
    • To reduce exposure, restrict SSH client connections to only trusted and verified SSH servers. Avoid initiating SSH connections to unknown or unverified hosts, as successful exploitation requires the client to connect to a malicious server.
    Full advisory and evidenceOpen source bulletin

More NetApp advisories

All NetApp advisories

Follow CVE-2026-66035 in the free weekly digest

Every Monday: whether it was added to CISA KEV, reported exploited, got a fix or changed severity, plus the week's critical and high advisories.

Free, no account. Confirm by email; unsubscribe in one click. Choose vendors and severity

Browse the latest tracked CVEs or the CVEs listed in CISA KEV.

iPhone and Android apps · New on the App Store

Get alerts for new CVEs on your phone.

Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 34 official vendor sources and 160+ reviewed platform categories.

Matching phone alertsOptional email delivery
Download on the App StoreGet CVE alerts on AndroidSee app features