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Ubuntu 22.04 LTS : Go vulnerability (USN-8883-1)

high Nessus Plugin ID 363809

Synopsis

The remote Ubuntu host is missing a security update.

Description

The remote Ubuntu 22.04 LTS host has packages installed that are affected by a vulnerability as referenced in the USN-8883-1 advisory.

 It was discovered that the Go x/net/idna package incorrectly handled certain Punycode-encoded labels that decoded to ASCII-only labels. An attacker could possibly use this issue to bypass hostname-based access controls and escalate privileges.

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 packages.

See Also

https://ubuntu.com/security/notices/USN-8883-1

Plugin Details

Severity: High

ID: 363809

File Name: ubuntu_USN-8883-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 10/7/2026

Updated: 10/7/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.83

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: High

Base Score: 8.2

Temporal Score: 7.1

Vector: CVSS:3.0/AV:N/AC:H/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: cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:golang-1.18-go, p-cpe:/a:canonical:ubuntu_linux:golang-1.18-src, p-cpe:/a:canonical:ubuntu_linux:golang-1.18, p-cpe:/a:canonical:ubuntu_linux:golang-1.21-go, p-cpe:/a:canonical:ubuntu_linux:golang-1.21-src, p-cpe:/a:canonical:ubuntu_linux:golang-1.21, p-cpe:/a:canonical:ubuntu_linux:golang-1.24-go, p-cpe:/a:canonical:ubuntu_linux:golang-1.24-src, p-cpe:/a:canonical:ubuntu_linux:golang-1.24

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/6/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-39821

USN: 8883-1