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FreeBSD : tailscale -- Insufficient validation of 4via6 subnet router destinations (4bf4495e-9d4e-11f1-a129-901b0e9408dc)

high Nessus Plugin ID 338840

Synopsis

The remote FreeBSD host is missing one or more security-related updates.

Description

The version of FreeBSD installed on the remote host is prior to tested version. It is, therefore, affected by a vulnerability as referenced in the 4bf4495e-9d4e-11f1-a129-901b0e9408dc advisory.

 Tailscale team reports:
 Insufficient validation of 4via6 subnet router destinations permitted access to host-scoped addresses, including cloud metadata and loopback services. TS-2026-11

Tenable has extracted the preceding description block directly from the FreeBSD security advisory.

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

Solution

Update the affected packages.

See Also

https://tailscale.com/security-bulletins#ts-2026-011

http://www.nessus.org/u?54063ae3

Plugin Details

Severity: High

ID: 338840

File Name: freebsd_pkg_4bf4495e9d4e11f1a129901b0e9408dc.nasl

Version: 1.1

Type: Local

Published: 8/22/2026

Updated: 8/22/2026

Supported Sensors: Nessus

Vulnerability Information

CPE: cpe:/o:freebsd:freebsd, p-cpe:/a:freebsd:freebsd:tailscale

Required KB Items: Host/local_checks_enabled, Host/FreeBSD/release, Host/FreeBSD/pkg_info

Exploit Ease: No known exploits are available

Patch Publication Date: 8/21/2026

Vulnerability Publication Date: 8/18/2026