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
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Go toolchain | cmd/go | unaffected |
|
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| golang.org/x/mod | golang.org/x/mod/sumdb | unaffected |
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Project Subscriptions
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Advisories
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Fixes
Solution
No solution given by the vendor.
Workaround
No workaround given by the vendor.
References
History
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 |
|
Projects
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MITRE
Status: PUBLISHED
Assigner: Go
Published:
Updated: 2026-08-13T21:58:53.605Z
Reserved: 2026-06-23T15:10:49.354Z
Link: CVE-2026-56864
Vulnrichment
No data.
NVD
Status : Received
Published: 2026-08-13T22:17:22.677
Modified: 2026-08-13T22:17:22.677
Link: CVE-2026-56864
Redhat
No data.
OpenCVE Enrichment
No data.
Weaknesses
No weakness.