CVE-2026-56864
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
- Published Aug 13, 2026
- CVSS 7.5 high
- 0.3% chance of exploitation in the next 30 days (EPSS)