Detections
Analytics

Fedora 45 : nsd (2026-c56ac69334)

high Nessus Plugin ID 344863

Language:

Synopsis

The remote Fedora host is missing one or more security updates.

Description

The remote Fedora 45 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-c56ac69334 advisory.

 BUG FIXES:

 Fix for CVE-2026-18664: IP range access control restrictions are bypassed for some unintended IP.
 Thanks to Qifan Zhang, Palo Alto Networks for the report Thanks to Claude and Ada Logics for the report https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18664.txt Fix for CVE-2026-18916: Any remote client can denial TCP service by throttling the TCP receive window (down to 1).
 Thanks to Akhil Koul (https://github.com/akoul) for the report https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-18916.txt Fix for CVE-2026-19401: Any remote client can denial UDP service by sending a specifically crafted query with multiple DNS Cookie options.
 Thanks to Qifan Zhang, Palo Alto Networks for the report Thanks to afldl [email protected] for the report https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19401.txt Fix for CVE-2026-19538: Anyone with access to the proxy protocol port over TCP or TLS can bypass BLOCKED access control items.
 Thanks to Qifan Zhang, Palo Alto Networks for the report https://www.nlnetlabs.nl/downloads/nsd/CVE-2026-19538.txt


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.

Solution

Update the affected nsd package.

See Also

https://bodhi.fedoraproject.org/updates/FEDORA-2026-c56ac69334

Plugin Details

Severity: High

ID: 344863

File Name: fedora_2026-c56ac69334.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/11/2026

Updated: 9/11/2026

Supported Sensors: Frictionless Assessment Agent, Nessus Agent, Agentless Assessment, Continuous Assessment, Tenable Cloud Security, Tenable Self-Hosted Container Security, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.41

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

Vector: CVSS2#AV:N/AC:L/Au:N/C:N/I:C/A:C

CVSS Score Source: CVE-2026-18664

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: High

Base Score: 8.2

Threat Score: 4.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N

CVSS Score Source: CVE-2026-19538

Vulnerability Information

CPE: cpe:/o:fedoraproject:fedora:45, p-cpe:/a:fedoraproject:fedora:nsd

Required KB Items: Host/local_checks_enabled, Host/RedHat/release, Host/RedHat/rpm-list

Exploit Ease: No known exploits are available

Patch Publication Date: 8/28/2026

Vulnerability Publication Date: 8/26/2026

Reference Information

CVE: CVE-2026-18664, CVE-2026-18916, CVE-2026-19401, CVE-2026-19538