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

high Tenable Cloud Security Plugin ID 445964

Description

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

- A malicious GOSUMDB was capable of serving arbitrary module content not contained within the transparency
log. This attack allows for a coordinating GOPROXY and GOSUMDB to serve a client malicious module content
that cannot be detected by evaluating the transparency log. In order to determine if you have been
affected: rm -r go.sum go.work.sum vendor/ && go mod tidy (CVE-2026-56864)

Solution

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

Plugin Details

Severity: High

ID: 445964

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: Low

Score: 3

Percentile: 23.72

CVSS v2

Risk Factor: Medium

Base Score: 5

Temporal Score: 3.7

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

CVSS Score Source: CVE-2026-56864

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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-2026-56864

Detections

Analytics