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Linux Distros Unpatched Vulnerability : CVE-2026-43617

medium Nessus Plugin ID 315597

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Synopsis

The Linux/Unix host has one or more packages installed with a vulnerability that the vendor indicates will not be patched.

Description

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

 - Rsync version 3.4.2 and prior contain an authorization bypass vulnerability in the rsync daemon's hostname-based access control list enforcement when configured with chroot. Attackers can bypass hostname- based deny rules by controlling the PTR record for their source IP address, allowing connections from hostnames that administrators intended to deny when reverse DNS resolution fails and defaults to UNKNOWN.
 (CVE-2026-43617)

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

Solution

There is no known solution at this time.

See Also

https://access.redhat.com/security/cve/cve-2026-43617

https://ubuntu.com/security/CVE-2026-43617

Plugin Details

Severity: Medium

ID: 315597

File Name: unpatched_CVE_2026_43617.nasl

Version: 1.8

Type: Local

Agent: unix

Family: Misc.

Published: 5/20/2026

Updated: 6/10/2026

Supported Sensors: Agentless Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 4

Temporal Score: 3.4

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

CVSS Score Source: CVE-2026-43617

CVSS v3

Risk Factor: Medium

Base Score: 4.8

Temporal Score: 4.4

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

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

Vulnerability Information

CPE: cpe:/o:centos:centos:7, p-cpe:/a:centos:centos:rsync-daemon, p-cpe:/a:redhat:enterprise_linux:rsync-daemon, cpe:/o:redhat:enterprise_linux:7, cpe:/o:redhat:enterprise_linux:9, p-cpe:/a:redhat:enterprise_linux:rsync, cpe:/o:redhat:enterprise_linux:8, cpe:/o:redhat:enterprise_linux:6, cpe:/o:centos:centos:8, p-cpe:/a:centos:centos:rsync, p-cpe:/a:redhat:enterprise_linux:rsync-rrsync, p-cpe:/a:centos:centos:rsync-rrsync, cpe:/o:redhat:enterprise_linux:10

Required KB Items: Host/cpu, Host/local_checks_enabled, global_settings/vendor_unpatched, Host/OS/identifier

Exploit Ease: No known exploits are available

Vulnerability Publication Date: 5/20/2026

Reference Information

CVE: CVE-2026-43617