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Highest advisory severityCritical 2 vendors · 2 advisories

CVE-2026-55953

Erlang/OTP Vulnerability in NetApp Products

CVE-2026-55953: Erlang/OTP Vulnerability in NetApp Products. Not in the CISA KEV catalog. Critical advisory severity (CVSS 9.1, 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-2026-55953 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Critical
CVSS base score
9.1 (NetApp), 7.4 (Red Hat)
Fixed releases
  • Red Hat: erlang27-main-27.3.4.15-0.1.hum1, RHSA-2026:47009
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-2026-55953; bulletin-wide values are not repeated here.

Is CVE-2026-55953 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-55953 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-2026-55953?

Upgrade to a fixed release named by the vendor:

  • Red Hat: erlang27-main-27.3.4.15-0.1.hum1, RHSA-2026:47009
  • Clients using only TLS 1.3 are not affected; the TLS 1.3 client handshake path validates the negotiated cipher suite. As a workaround for TLS 1.2/DTLS clients prior to upgrading, explicitly disable anonymous cipher suites (TLS_DH_anon_*, TLS_ECDH_anon_*) in the ssl client configuration, or restrict the client to TLS 1.3-only. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory
  • Advisory severityCritical9.1

    Critical [CVE-2026-55953] Erlang/OTP Vulnerability in NetApp Products

    NTAP-20260828-0008Source published Source updated

    Erlang/OTP versions R13B03 prior to 27.3.4.15, from 28.0 prior to 28.5.0.4, and from 29.0 prior to 29.0.4 are susceptible to a vulnerability which when successfully exploited could lead to disclosure of sensitive information or addition or modification of data. 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
    • 27.3.4.15
    • 28.0
    • 28.5.0.4
    • 29.0

    1 more entries in the full advisory.

    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 severityHigh7.4

    High [CVE-2026-55953] Erlang/OTP ssl client: Authentication bypass via unoffered anonymous cipher suite acceptance

    CVE-2026-55953Source published Source updated

    The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotiated protocol version and the downgrade sentinel but hands the server-chosen suite directly to ssl_handshake:handle_server_hello_extensions/9, which installs it without a membership check. The TLS 1.3 client path performs this check (per RFC 8446), so it is not affected. An on-path attacker between the client and the intended server can respond with a ServerHello selecting an anonymous key exchange suite such as TLS_DH_anon_* or TLS_ECDH_anon_* that the client never offered. Anonymous suites do not require the server to present a…

    Affected products in this advisory
    • Red Hat Hardened Images
    • Red Hat OpenStack Platform 16.2
    • Red Hat OpenStack Platform 17.1
    • Red Hat OpenStack Platform 18.0
    Source-reported affected versions
    • < 27.3.4.15
    • < 28.0
    • < 28.5.0.4
    • < 29.0

    7 more entries in the full advisory.

    Source-reported fixed versions
    • erlang27-main-27.3.4.15-0.1.hum1
    • RHSA-2026:47009
    Mitigation guidance
    • Clients using only TLS 1.3 are not affected; the TLS 1.3 client handshake path validates the negotiated cipher suite. As a workaround for TLS 1.2/DTLS clients prior to upgrading, explicitly disable anonymous cipher suites (TLS_DH_anon_*, TLS_ECDH_anon_*) in the ssl client configuration, or restrict the client to TLS 1.3-only.
    Full advisory and evidenceOpen source bulletin

More NetApp advisories

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