CVE-2026-56864

high

Description

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

References

https://pkg.go.dev/vuln/GO-2026-6180

https://groups.google.com/g/golang-announce/c/94pEornpRlI

https://go.dev/issue/80745

https://go.dev/cl/815020

https://go.dev/cl/815000

Details

Source: Mitre, NVD

Published: 2026-08-13

Updated: 2026-08-14

Risk Information

CVSS v2

Base Score: 7.8

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

Severity: High

CVSS v3

Base Score: 7.5

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Severity: High

EPSS

EPSS: 0.00118