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CVE-2026-76163

HIGH 7.5

Published 2026-09-16 · Last modified 2026-09-17

If BIND is loaded with a "`named.conf`" file that contains no global "`options`" block, an attacker can send a query of QTYPE TKEY which may cause an assertion failure and subsequent unexpected program exit. This issue affects BIND 9 versions 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, and 9.20.9-S1 through 9.20.27-S1.

ELEVATED IMPACT

Severe if exploited (CVSS 7.5), but no known exploitation and low modeled probability. Patch on a normal cadence.

Exploitation likelihood

0.6%chance of exploitation in 30 days · 47th percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

7.5CVSS 3.1 · HIGH

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityHigh

What an attacker needs

  • ✓Access: Reachable over the network — no local access needed
  • ✓Privileges: No account or privileges required
  • ✓User interaction: No user interaction needed
  • ✓Complexity: No special conditions — reliably repeatable

✓ lowers the bar for an attacker · ⚠ raises it

Proof of concept

No public PoC is currently catalogued.

Search for new PoCs

Search GitHub now — results may be empty or unverified.

Tracked sources are checked daily for recent CVEs, including PoCs published after the original disclosure. A later release appears after a tracked source lists it and a refresh succeeds.

Data snapshot:

Affected

Vendors Isc

Products Bind 9

Weakness (CWE)

  • CWE-617: Reachable Assertion

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References and research data (JSON)

Vendor product assessments

Showing 32 of 102 vendor product statements; 70 omitted. Read the full vendor advisory.

  • bind-0:9.20.29-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-0:9.20.29-0.1.hum1@src as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=src&distro=hummingbird-20251124&repository_id=public-hummingbird-source-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-0:9.20.29-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-chroot-0:9.20.29-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-chroot-0:9.20.29-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-devel-0:9.20.29-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-devel-0:9.20.29-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-dnssec-utils-0:9.20.29-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-dnssec-utils-0:9.20.29-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-doc-0:9.20.29-0.1.hum1@noarch@public-hummingbird-aarch64-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-doc-0:9.20.29-0.1.hum1@noarch@public-hummingbird-x86_64-rpms as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=noarch&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-libs-0:9.20.29-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-libs-0:9.20.29-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-utils-0:9.20.29-0.1.hum1@aarch64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=aarch64&distro=hummingbird-20251124&repository_id=public-hummingbird-aarch64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-utils-0:9.20.29-0.1.hum1@x86_64 as a component of Red Hat Hardened Images · fixed

    Vendor assessment for this product only.

    pkg:rpm/redhat/[email protected]?arch=x86_64&distro=hummingbird-20251124&repository_id=public-hummingbird-x86_64-rpms

    • vendor fix: For details on how to apply this update, which includes the changes described in this advisory, refer to: https://images.redhat.com/ Vendor guidance
    • workaround: To mitigate this issue, ensure that the BIND configuration file (`named.conf`) includes a global `options` block. If no such block exists, adding an empty `options {}` block will prevent the vulnerability. After modifying `named.conf`, the `named` service must be restarted for the changes to take effect. This may temporarily interrupt DNS resolution.
    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-libs as a component of Red Hat Enterprise Linux 10 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-libs

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-devel as a component of Red Hat Enterprise Linux 6 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-devel

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-libs-lite as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-libs-lite

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-pkcs11-libs as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-pkcs11-libs

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind.src as a component of Red Hat Enterprise Linux 7 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind?arch=src

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-libs as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-libs

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-pkcs11-devel as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-pkcs11-devel

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-utils as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-utils

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind9.16-doc as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind9.16-doc

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • python3-bind as a component of Red Hat Enterprise Linux 8 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/python3-bind

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind-dnssec-doc as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind-dnssec-doc

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind.src as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind?arch=src

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • bind9.18-doc as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/bind9.18-doc

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • dhcp-relay as a component of Red Hat Enterprise Linux 9 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:rpm/redhat/dhcp-relay

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00
  • openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known not affected

    Vendor assessment for this product only.

    Reason: vulnerable code not present

    pkg:oci/[email protected]?repository_url=registry.redhat.io/openshift/ose-rhel-coreos-9

    Red Hat · CVE-2026-76163 · Updated 2026-09-21T10:39:38+00:00

All CVSS metrics

  • HIGH 7.5 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • HIGH 7.5 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS