A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache poisoning.

There are packages installed that are affected by multiple vulnerabilities referenced in the following CVEs:

  - A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache
    poisoning. (CVE-2026-33612)

  - ECS zero scoped answers are stored in the packet cache while they should not. This impacts only
    configurations that have ECS enabled; (CVE-2026-40012)

  - An attacker can send a web request that causes unlimited memory allocation in the internal web server,
    leading to a denial of service. The internal web server is disabled by default. (CVE-2026-42005)

  - A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to a
    crash of the Recursor due to insuffcient input validation. (CVE-2026-42387)

The remote Fedora 44 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-088b60c071 advisory.

    update to latest upstream release to fix CVEs





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

  - A malicious authoritative server can send a crafted zone via the ZoneToCache function that leads to cache     poisoning. (CVE-2026-33612)

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

The remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6369 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6369-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     June 25, 2026                         https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : pdns-recursor     CVE ID         : CVE-2026-33612 CVE-2026-40012 CVE-2026-42005                      CVE-2026-42387 CVE-2026-42388 CVE-2026-42390                      CVE-2026-52690

    Multiple vulnerabiliites have been discovered in PDNS Recursor, a     resolving name server which could result in denial of service, cache     poisoning or information disclosure.

    For the stable distribution (trixie), these problems have been fixed in     version 5.2.11-0+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.

ID	Name	Product	Family	Type	Severity
445413	Alpine: multiple pdns-recursor packages: security update to 5.4.3-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	Local	high
445413	Alpine: multiple pdns-recursor packages: security update to 5.4.3-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	Local	high
325055	Fedora 44 : pdns-recursor (2026-088b60c071)	Nessus	Fedora Local Security Checks	Local	high
323406	Linux Distros Unpatched Vulnerability : CVE-2026-33612	Nessus	Misc.	Local	high
323062	Debian dsa-6369 : pdns-recursor - security update	Nessus	Debian Local Security Checks	Local	high

Detections

Analytics

CVE-2026-33612

high

Tenable Plugins

high

high

high

high

high