NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver over UDP, lacks matching the query destination address and port with the response source address and port. Furthermore not the query ID, neither the question of the query is matched with that of the response. This makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.

The version of Tencent Linux installed on the remote TencentOS Server 4 host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the TSSA-2026:0557 advisory.

    Package updates are available for TencentOS Server 4 that fix the following vulnerabilities:

    CVE-2026-10846:
    NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver     over UDP, lacks matching the query destination address and port with the response source address and port.
    Furthermore not the query ID, neither the question of the query is matched with that of the response. This     makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path     poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.

Tenable has extracted the preceding description block directly from the Tencent Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 43 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-b33ba1aa06 advisory.

    Update to 1.9.2 for CVE-2026-10846

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 71a85f96-6f18-11f1-8569-3c7c3fba4204 advisory.

    https://www.nlnetlabs.nl/downloads/ldns/CVE-2026-10846.txt reports:
    NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used     in applications as (stub) resolver over UDP, lacks matching the     query destination address and port with the response source address     and port.  Furthermore not the query ID, neither the question of     the query is matched with that of the response.  This makes     applications, that use ldns for (stub) resolver functionality over     UDP, vulnerable for off-path poisoning attacks.  The drill tool,     which is shipped with ldns, suffers from this vulnerability.
    We would like to thank Pablo Ruiz from codecome.ai for finding and reporting     this vulnerability.

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLED15 / SLED_SAP15 / SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:2462-1 advisory.

    This update for ldns fixes the following issue

    - CVE-2026-10846: When ldns is used by applications for (stub) resolving, it does not sufficiently verify     that received       responses belong to a sent query (bsc#1267670).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote SUSE Linux SLES15 / SLES_SAP15 host has packages installed that are affected by a vulnerability as referenced in the SUSE-SU-2026:2461-1 advisory.

    This update for ldns fixes the following issue

    - CVE-2026-10846: When ldns is used by applications for (stub) resolving, it does not sufficiently verify     that received       responses belong to a sent query (bsc#1267670).

Tenable has extracted the preceding description block directly from the SUSE security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8449-1 advisory.

    Pablo Ruiz discovered that ldns did not properly validate DNS responses when used as a stub resolver over     UDP. A remote attacker could possibly use this issue to inject arbitrary DNS responses.

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The remote Fedora 44 host has a package installed that is affected by a vulnerability as referenced in the FEDORA-2026-1c6479b257 advisory.

    Update to 1.9.2 for CVE-2026-10846

Tenable has extracted the preceding description block directly from the Fedora security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the fc0c7763-6477-11f1-958d-bc241121aa0a advisory.

    When used as a stub resolver over UDP, ldns failed to verify               that a received response belonged to the outstanding query.  It did               not check that the response source address and port matched the               query destination, that the transaction ID matched, or that the               question section of the response matched that of the query.
    Without these checks, an off-path attacker who cannot observe               the query can forge UDP responses that ldns will accept as genuine.
              By injecting spoofed replies, the attacker can return arbitrary DNS               data to any program that uses ldns for stub resolving, including               drill(1).

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available.

  - NLnet Labs ldns 1.2.0 up to and including versions 1.9.0, when used in applications as (stub) resolver     over UDP, lacks matching the query destination address and port with the response source address and port.
    Furthermore not the query ID, neither the question of the query is matched with that of the response. This     makes applications, that use ldns for (stub) resolver functionality over UDP, vulnerable for off-path     poisoning attacks. The drill tool, which is shipped with ldns, suffers from this vulnerability.
    (CVE-2026-10846)

Note that Nessus relies on the presence of the package as reported by the vendor.

ID	Name	Product	Family	Severity
325849	TencentOS Server 4: ldns (TSSA-2026:0557)	Nessus	Tencent Local Security Checks	high
323142	Fedora 43 : ldns (2026-b33ba1aa06)	Nessus	Fedora Local Security Checks	high
322504	FreeBSD : ldns -- CWE-346 Origin Validation Error (71a85f96-6f18-11f1-8569-3c7c3fba4204)	Nessus	FreeBSD Local Security Checks	high
321924	SUSE SLED15 / SLES15 Security Update : ldns (SUSE-SU-2026:2462-1)	Nessus	SuSE Local Security Checks	high
321920	SUSE SLES15 Security Update : ldns (SUSE-SU-2026:2461-1)	Nessus	SuSE Local Security Checks	high
321765	Ubuntu 16.04 LTS / 18.04 LTS / 20.04 LTS / 22.04 LTS / 24.04 LTS / 26.04 LTS : ldns vulnerability (USN-8449-1)	Nessus	Ubuntu Local Security Checks	high
321474	Fedora 44 : ldns (2026-1c6479b257)	Nessus	Fedora Local Security Checks	high
320463	FreeBSD : FreeBSD -- Insufficient response validation in the ldns stub resolver (fc0c7763-6477-11f1-958d-bc241121aa0a)	Nessus	FreeBSD Local Security Checks	high
320443	Linux Distros Unpatched Vulnerability : CVE-2026-10846	Nessus	Misc.	high

Detections

Analytics

CVE-2026-10846

high

Tenable Plugins

high

high

high

high

high

high

high

high

high