Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in Recursor.

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by multiple vulnerabilities as referenced in the 67793feb-0b5b-11f1-a1c0-0050569f0b83 advisory.

    PowerDNS Team reports:
    2025-07: Internal logic flaw in cache management can lead to             a denial of service in Recursor     2025-08: Insufficient validation of incoming notifies over             TCP can lead to a denial of service in Recursor     2026-01: Crafted zones can lead to increased resource usage in Recursor     2026-01: This problem can be triggered by publishing and querying a crafted             zone that causes large memory usage.

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

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

The remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6134 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6134-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     February 13, 2026                     https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : pdns-recursor     CVE ID         : CVE-2026-0398 CVE-2026-24027

    Two vulnerabiliites have been discovered in PDNS Recursor, a resolving     name server which result result in denial of service when processing a     malformed zone file.

    For the stable distribution (trixie), these problems have been fixed in     version 5.2.8-0+deb13u1.

    We recommend that you upgrade your pdns-recursor packages.

    For the detailed security status of pdns-recursor please refer to     its security tracker page at:
    https://security-tracker.debian.org/tracker/pdns-recursor

    Further information about Debian Security Advisories, how to apply     these updates to your system and frequently asked questions can be     found at: https://www.debian.org/security/

    Mailing list: debian-security-announce@lists.debian.org

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

Note that Nessus has not tested for these issues 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.

  - Crafted zones can lead to increased resource usage and crafted CNAME chains can lead to cache poisoning in     Recursor. (CVE-2026-0398)

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

ID	Name	Product	Family	Severity
299351	FreeBSD : powerdns-recursor -- Denial of Service (67793feb-0b5b-11f1-a1c0-0050569f0b83)	Nessus	FreeBSD Local Security Checks	high
299057	Debian dsa-6134 : pdns-recursor - security update	Nessus	Debian Local Security Checks	medium
298462	Linux Distros Unpatched Vulnerability : CVE-2026-0398	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-0398

medium

Tenable Plugins

high

medium

medium