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Highest advisory severityMedium 2 vendors · 2 advisories

CVE-2026-58218

Samba Vulnerability in NetApp Products

CVE-2026-58218: Samba Vulnerability in NetApp Products. Not in the CISA KEV catalog. Medium advisory severity (CVSS 5.3, 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-2026-58218 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
Medium
CVSS base score
5.3 (NetApp), 5.3 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L (Red Hat)
Weakness
CWE-410
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-2026-58218; bulletin-wide values are not repeated here.

Is CVE-2026-58218 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-58218 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-2026-58218?

The tracked advisories that cover only this CVE do not list a fixed release yet. That does not mean no fix exists; check each vendor source below.

Vendor advisory comparison

NetApp

1 advisory
  • Advisory severityMedium5.3

    Medium [CVE-2026-58218] Samba Vulnerability in NetApp Products

    NTAP-20260821-0016Source published Source updated

    Samba versions 4.0 and higher are susceptible to a vulnerability which when successfully exploited could allow an unauthenticated user to practically block the use of DNS TSIG signing by repeatedly registering TKEY names, flooding a cache and causing legitimate TKEYs to be expunged. Successful exploitation of this vulnerability could lead to 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
    Affected-version details not available in this record.
    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.
    Workarounds
    • Samba versions 4.0 and higher are susceptible to a vulnerability which when successfully exploited could allow an unauthenticated user to practically block the use of DNS TSIG signing by repeatedly registering TKEY names, flooding a cache and causing legitimate TKEYs to be expunged.
    Full advisory and evidenceOpen source bulletin

Red Hat

1 advisory
  • Advisory severityMedium5.3

    Medium [CVE-2026-58218] DNS signing DoS via TKEY name cache exhaustion

    CVE-2026-58218Source published Source updated

    A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service. Red Hat Product Security has rated this vulnerability as having a Moderate security impact for Samba deployments operating as an Active Directory Domain Controller (AD DC) using the internal DNS server. ``` Red Hat Enterprise Linux (RHEL) context: Standard Red Hat Enterprise Linux deployments are not affected. RHEL does not support the Samba Active…

    Affected products in this advisory
    No product details extracted. Check the source bulletin.
    Source-reported affected versions
    Affected-version details not available in this record.
    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

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