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
History

Fri, 14 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-347
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N'}

ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 14 Aug 2026 13:00:00 +0000

Type Values Removed Values Added
First Time appeared Golang
Golang mod
Gotoolchain
Gotoolchain cmd/go
Vendors & Products Golang
Golang mod
Gotoolchain
Gotoolchain cmd/go

Fri, 14 Aug 2026 01:00:00 +0000

Type Values Removed Values Added
Weaknesses CWE-200

Thu, 13 Aug 2026 22:15:00 +0000

Type Values Removed Values Added
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
Title Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb
References

cve-icon MITRE

Status: PUBLISHED

Assigner: Go

Published:

Updated: 2026-08-14T16:16:42.248Z

Reserved: 2026-06-23T15:10:49.354Z

Link: CVE-2026-56864

cve-icon Vulnrichment

Updated: 2026-08-14T16:16:22.544Z

cve-icon NVD

Status : Received

Published: 2026-08-13T22:17:22.677

Modified: 2026-08-14T17:19:14.060

Link: CVE-2026-56864

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-14T12:14:24Z