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Highest advisory severityHigh 2 vendors · 2 advisories

CVE-2026-13321

ISC BIND Vulnerability in NetApp Products

CVE-2026-13321: ISC BIND Vulnerability in NetApp Products. Not in the CISA KEV catalog. High advisory severity (CVSS 8.6, 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-2026-13321 key facts

CISA KEV
Not listed (catalog checked )
Highest advisory severity
High
CVSS base score
8.6 (NetApp), 8.6 (Red Hat)
CVSS vector
  • CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N (Red Hat)
Weakness
CWE-345
Fixed releases
  • Red Hat: bind-32:9.18.33-15.el10_2.10, bind-32:9.11.4-26.P2.el7_9.21, bind9.16-32:9.16.23-0.22.el8_10.12, bind-32:9.11.36-16.el8_10.14, bind9.16-32:9.16.23-0.7.el8_6.11, bind9.16-32:9.16.23-0.14.el8_8.9 and 26 more in the advisory
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-2026-13321; bulletin-wide values are not repeated here.

Is CVE-2026-13321 exploited?

No exploitation is reported in the sources VulniPulse tracks: CVE-2026-13321 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-2026-13321?

Upgrade to a fixed release named by the vendor:

  • Red Hat: bind-32:9.18.33-15.el10_2.10, bind-32:9.11.4-26.P2.el7_9.21, bind9.16-32:9.16.23-0.22.el8_10.12, bind-32:9.11.36-16.el8_10.14, bind9.16-32:9.16.23-0.7.el8_6.11, bind9.16-32:9.16.23-0.14.el8_8.9
  • Disclaimer: The following mitigation notes are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. ISC states no workarounds exist. Until patched, restrict the resolver to authorized client networks and deploy separate resolvers per trust zone. Memory hardening and auth controls don't apply — this is a DNS protocol logic error using validly-signed records. (Red Hat)

Vendor advisory comparison

NetApp

1 advisory
  • Advisory severityHigh8.6

    High [CVE-2026-13321] ISC BIND Vulnerability in NetApp Products

    NTAP-20260730-0001Source published Source updated

    ISC BIND versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, and 9.21.0 through 9.21.23 are susceptible to a vulnerability which when successfully exploited could lead to addition or modification of data. Successful exploitation of this vulnerability could lead to 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
    • 9.11.0
    • 9.18.50
    • 9.20.0
    • 9.20.24

    2 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 severityHigh8.6

    High [CVE-2026-13321] DNSSEC Validation Bypass via Out-of-Zone NSEC Next Field

    CVE-2026-13321Source published Source updated

    The BIND resolver accepts validly-signed NSEC records where the "Next Domain Name" field points outside the signer's zone. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.24, 9.21.0 through 9.21.23, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.24-S1. An attacker controlling any DNSSEC-signed zone can craft NSEC records that span into victim zones, enabling cross-zone cache poisoning with authenticated denial-of-service responses (AD=1). Red Hat severity: Important — CVSS 8.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:H/A:N). Weakness: CWE-345.

    Affected products in this advisory
    • Red Hat Enterprise Linux 10
    • Red Hat Enterprise Linux 7 Extended Lifecycle Support
    • Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support
    • Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On

    12 more entries in the full advisory.

    Source-reported affected versions
    • 9.11.0
    • 9.18.50
    • 9.20.0
    • 9.20.24

    4 more entries in the full advisory.

    Source-reported fixed versions
    • bind-32:9.18.33-15.el10_2.10
    • bind-32:9.11.4-26.P2.el7_9.21
    • bind9.16-32:9.16.23-0.22.el8_10.12
    • bind-32:9.11.36-16.el8_10.14

    28 more entries in the full advisory.

    Mitigation guidance
    • Disclaimer: The following mitigation notes are provided as a courtesy, pending the application of an official patch. This content was generated utilizing AI tools in conjunction with data from cmetaxonomy.org. Customers are advised to independently evaluate and test these temporary mitigations within their own infrastructure. ISC states no workarounds exist. Until patched, restrict the resolver to authorized client networks and deploy separate resolvers per trust zone. Memory hardening and auth controls don't apply — this is a DNS protocol logic error using validly-signed records.
    Full advisory and evidenceOpen source bulletin

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