CVE-2026-56864
N/A
N/A
Summary
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
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Go toolchain | cmd/go | 0 < 1.25.13 | affected |
| Go toolchain | cmd/go | 1.26.0-0 < 1.26.6 | affected |
| Go toolchain | cmd/go | 1.27.0-0 < 1.27.0-rc.3 | affected |
| golang.org/x/mod | golang.org/x/mod/sumdb | 0 < 0.40.0 | affected |
Weaknesses
- CWE-347: Improper Verification of Cryptographic Signature
References
- https://go.dev/issue/80745
- https://groups.google.com/g/golang-announce/c/94pEornpRlI
- https://go.dev/cl/815000
- https://go.dev/cl/815020
- https://pkg.go.dev/vuln/GO-2026-6180
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