Detections
Analytics

Ubuntu 18.04 LTS / 20.04 LTS : Go Networking vulnerability (USN-8416-1)

critical Nessus Plugin ID 320404

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8416-1 advisory.

 It was discovered that Go Networking incorrectly handled certain Punycode-encoded labels in the idna package. An attacker could possibly use this issue to bypass hostname-based access restrictions.

Tenable has extracted the preceding description block directly from the Ubuntu 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 golang-go.net-dev and / or golang-golang-x-net-dev packages.

See Also

https://ubuntu.com/security/notices/USN-8416-1

Plugin Details

Severity: Critical

ID: 320404

File Name: ubuntu_USN-8416-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/11/2026

Updated: 6/11/2026

Supported Sensors: Continuous Assessment, Nessus Agent, Nessus

Risk Information

VPR

Risk Factor: High

Score: 7.1

CVSS v2

Risk Factor: High

Base Score: 9.4

Temporal Score: 7

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

CVSS Score Source: CVE-2026-39821

CVSS v3

Risk Factor: Critical

Base Score: 9.6

Temporal Score: 8.3

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

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:golang-golang-x-net-dev, cpe:/o:canonical:ubuntu_linux:18.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:golang-go.net-dev, cpe:/o:canonical:ubuntu_linux:20.04:-:lts

Required KB Items: Host/cpu, Host/Ubuntu, Host/Ubuntu/release, Host/Debian/dpkg-l

Exploit Ease: No known exploits are available

Patch Publication Date: 6/9/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-39821

USN: 8416-1