Golang: stdlib: security update to 1.25.13stdlib: security update to 1.26.6stdlib: security update to 1.27.0-rc.3

critical Tenable Cloud Security Plugin ID 445968

Description

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

- A malicious GOPROXY was previously capable of forging up to two sumdb tiles that allow for a requested
module to bypass the GOSUMDB check and persist attacker-controlled module content to a local Go module
cache. This attack allows for a malicious GOPROXY to serve malicious module content that cannot be
detected by evaluating the transparency log. All tiles are now correctly verified against their parents.
In order to determine if you have been affected: rm -r go.sum go.work.sum vendor/ && go mod tidy
(CVE-2026-56865)

Solution

Update the stdlib library and its related packages to version 1.25.13 or later.

Plugin Details

Severity: Critical

ID: 445968

Version: Revision 1.2

Type: Local

Family: Golang

Published: 8/14/2026

Updated: 8/14/2026

Supported Sensors: Tenable Cloud Security, Tenable Self-Hosted Container Security

Risk Information

VPR

Risk Factor: Medium

Score: 4.3

Percentile: 53.58

CVSS v2

Risk Factor: Medium

Base Score: 6.4

Temporal Score: 4.7

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

CVSS Score Source: CVE-2026-56865

CVSS v3

Risk Factor: Critical

Base Score: 9.1

Temporal Score: 7.9

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/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: 8/13/2026

Vulnerability Publication Date: 8/13/2026

Reference Information

CVE: CVE-2026-56865

Detections

Analytics