Vulnerability 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
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://go.dev/cl/815000
- https://go.dev/cl/815020
- https://go.dev/issue/80745
- https://groups.google.com/g/golang-announce/c/94pEornpRlI
- https://pkg.go.dev/vuln/GO-2026-6180
FAQ
What is CVE-2026-56864?
CVE-2026-56864 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 mod...
How severe is CVE-2026-56864?
CVE-2026-56864 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-56864?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.