A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of service.

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 remote Debian 13 host has a package installed that is affected by multiple vulnerabilities as referenced in the dsa-6234 advisory.

    - -------------------------------------------------------------------------     Debian Security Advisory DSA-6234-1                   security@debian.org     https://www.debian.org/security/                       Moritz Muehlenhoff     April 28, 2026                        https://www.debian.org/security/faq
    - -------------------------------------------------------------------------

    Package        : pdns-recursor     CVE ID         : CVE-2026-33257 CVE-2026-33258 CVE-2026-33259                      CVE-2026-33260 CVE-2026-33261 CVE-2026-33600                      CVE-2026-33601

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

    For the stable distribution (trixie), these problems have been fixed in     version 5.2.9-0+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.

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

  - By publishing and querying a crafted zone an attacker can cause allocation of large entries in the
    negative and aggressive NSEC(3) caches. (CVE-2026-33258)

  - 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-2026-33256)

  - Having many concurrent transfers of the same RPZ can lead to inconsistent RPZ data, use after free and/or
    a crash of the recursor. Normally concurrent transfers of the same RPZ zone can only occur with a
    malfunctioning RPZ provider. (CVE-2026-33259)

  - A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of
    service. (CVE-2026-33261)

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

  - A zone transition from NSEC to NSEC3 might trigger an internal inconsistency and cause a denial of     service. (CVE-2026-33261)

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

ID	Name	Product	Family	Severity
325055	Fedora 44 : pdns-recursor (2026-088b60c071)	Nessus	Fedora Local Security Checks	high
310795	Debian dsa-6234 : pdns-recursor - security update	Nessus	Debian Local Security Checks	high
440948	Alpine: multiple pdns-recursor packages: security update to 5.3.6-r0	Tenable Cloud Security	Alpine Linux Local Security Checks	high
440948	Alpine: multiple pdns-recursor packages: security update to 5.3.6-r0	Tenable Self-Hosted Container Security	Alpine Linux Local Security Checks	high
309879	Linux Distros Unpatched Vulnerability : CVE-2026-33261	Nessus	Misc.	medium

Detections

Analytics

CVE-2026-33261

medium

Tenable Plugins

high

high

high

high

medium