If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through 9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through 9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1.

The version of bind installed on the remote host is prior to 9.18.47 / 9.20.21. It is, therefore, affected by a vulnerability as referenced in the SSA:2026-084-01 advisory.

    New bind packages are available for Slackware 15.0 and -current to fix security issues.

Tenable has extracted the preceding description block directly from the bind 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 45 host has packages installed that are affected by a vulnerability as referenced in the FEDORA-2026-8db2f80244 advisory.

    # Update to 9.18.47 (rhbz#2440561)

    ## Security Fixes:

    - Fix unbounded NSEC3 iterations when validating referrals to unsigned delegations. (CVE-2026-1519)

    Source: https://downloads.isc.org/isc/bind9/9.18.47/doc/arm/html/notes.html#notes-for-bind-9-18-47

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

  - If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver     may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are     circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-     does-my-authoritative-server-make-recursive-queries). This issue affects BIND 9 versions 9.11.0 through     9.16.50, 9.18.0 through 9.18.46, 9.20.0 through 9.20.20, 9.21.0 through 9.21.19, 9.11.3-S1 through     9.16.50-S1, 9.18.11-S1 through 9.18.46-S1, and 9.20.9-S1 through 9.20.20-S1. (CVE-2026-1519)

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

The version of ISC BIND installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the cve-2026-1519 advisory.

  - If a BIND resolver is performing DNSSEC validation and encounters a maliciously crafted zone, the resolver     may consume excessive CPU. Authoritative-only servers are generally unaffected, although there are     circumstances where authoritative servers may make recursive queries (see: https://kb.isc.org/docs/why-     does-my-authoritative-server-make-recursive-queries).If this issue is encountered, the resolver may     experience excessive CPU consumption and a sharp decrease in the number of queries per second that it can     handle.         -  Authoritative services are believed to be unaffected by this vulnerability but it is     important to read: https://kb.isc.org/docs/why-does-my-authoritative-server-make-recursive-queries
    -  Resolvers are affected by this vulnerability.  Authoritative services are believed to be unaffected by     this vulnerability but it is important to read:  https://kb.isc.org/docs/why-does-my-authoritative-server-     make-recursive-queries Resolvers are affected by this vulnerability. (CVE-2026-1519)

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

ID	Name	Product	Family	Severity
303766	Slackware Linux 15.0 / current bind Vulnerability (SSA:2026-084-01)	Nessus	Slackware Local Security Checks	high
303759	Fedora 45 : bind / bind-dyndb-ldap (2026-8db2f80244)	Nessus	Fedora Local Security Checks	high
303734	Linux Distros Unpatched Vulnerability : CVE-2026-1519	Nessus	Misc.	high
303599	ISC BIND 9.11.0 < 9.18.47 / 9.11.3-S1 < 9.18.47-S1 / 9.18.0 < 9.18.47 / 9.18.11-S1 < 9.18.47-S1 / 9.20.0 < 9.20.21 / 9.20.9-S1 < 9.20.21-S1 / 9.21.0 < 9.21.20 Vulnerability (cve-2026-1519)	Nessus	DNS	high

Detections

Analytics

CVE-2026-1519

high

Tenable Plugins

high

high

high

high