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CVE-2026-75029

MEDIUM 5.3

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

In a query response, an attacker may send `named` multiple copies of a record that should only exist once (such as an SOA record). If the RDATA is the same on all the copies, the record is appended to the in-memory RDATA set, which can cause increased memory usage of the negative cache and possibly lead to other memory attack vectors. This issue affects BIND 9 versions 9.11.0 through 9.18.50, 9.20.0 through 9.20.27, 9.21.0 through 9.21.25, 9.11.3-S1 through 9.18.50-S1, and 9.20.9-S1 through 9.20.27-S1.

NO EXPLOITATION SIGNALS

No known exploitation, public exploit, or elevated probability at this time. Track for changes.

Exploitation likelihood

0.5%chance of exploitation in 30 days · 41st percentile

○ In CISA KEV ○ Catalogued PoC

Impact if exploited

5.3CVSS 3.1 · MEDIUM

  • ConfidentialityNone
  • IntegrityNone
  • AvailabilityLow

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

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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-405: Asymmetric Resource Consumption (Amplification)

CVSS vector

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

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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-utils as a component of Red Hat Enterprise Linux 10 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind-utils

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-libs-lite as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind-libs-lite

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-sdb as a component of Red Hat Enterprise Linux 7 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind-sdb

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-export-libs as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind-export-libs

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-pkcs11-libs as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind-pkcs11-libs

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind9.16-chroot as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind9.16-chroot

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • python3-bind as a component of Red Hat Enterprise Linux 8 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/python3-bind

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-doc as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind-doc

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind9.18-dnssec-utils as a component of Red Hat Enterprise Linux 9 · known affected

    Vendor assessment for this product only.

    pkg:rpm/redhat/bind9.18-dnssec-utils

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • openshift/ose-rhel-coreos-9 as a component of Red Hat OpenShift Container Platform 4 · known affected

    Vendor assessment for this product only.

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

    • workaround: To mitigate this issue, restrict network access to the BIND `named` service to only trusted clients and networks. Implement firewall rules to limit incoming UDP/TCP port 53 traffic to known, legitimate sources. This reduces the attack surface by preventing untrusted external entities from sending crafted query responses.
    • none available: Fix deferred
    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind 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

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-chroot 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-chroot

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-sdb 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-sdb

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind-utils 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-utils

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • bind.src 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?arch=src

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • dhcp-client 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-client

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+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-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • dhcp-server 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-server

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00
  • dhcp.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/dhcp?arch=src

    Red Hat · CVE-2026-75029 · Updated 2026-09-21T11:37:49+00:00

All CVSS metrics

  • MEDIUM 5.3 v3.1 · CNA Primary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
  • MEDIUM 5.3 v3.1 · NVD Secondary
    CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

References

Patches & mitigations

Advisories

Technical & other

Sources: NVD · CVE.org · EPSS