Detections
Analytics

Echo: golang.org/x/net: security update to 0.55.0

high Tenable Self-Hosted Container Security Plugin ID 473564

Description

There are packages installed that are affected by a vulnerability referenced in the following CVE:

 - The ToASCII and ToUnicode functions incorrectly accept Punycode-encoded labels that decode to an ASCII-
 only label. For example, ToUnicode("xn--example-.com") incorrectly returns the name "example.com" rather
 than an error. This behavior can lead to privilege escalation in programs using the idna package. For
 example, a program which performs privilege checks on the ASCII hostname may reject "example.com" but
 permit "xn--example-.com". If that program subsequently converts the ASCII hostname to Unicode, it will
 inadvertently permits access to the Unicode name "example.com". (CVE-2026-39821)

Solution

Update the golang.org/x/net library and its related packages to version 0.55.0 or later.

See Also

https://advisory.echohq.com/cve/CVE-2026-39821

Plugin Details

Severity: High

ID: 473564

Version: Revision 1.1

Type: Local

Published: 10/7/2026

Updated: 10/7/2026

Risk Information

VPR

Risk Factor: Medium

Score: 4.8

Percentile: 57.98

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

Exploit Ease: No known exploits are available

Patch Publication Date: 10/7/2026

Vulnerability Publication Date: 5/12/2026

Reference Information

CVE: CVE-2026-39821