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CVE-2026-56864

Ignore unrelated, unauthenticated hashes in Lookup in golang.org/x/mod/sumdb PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
Go toolchain / cmd/goaffected 0 before 1.25.13; affected 1.26.0-0 before 1.26.6; affected 1.27.0-0 before 1.27.0-rc.3
golang.org/x/mod / golang.org/x/mod/sumdbaffected 0 before 0.40.0

CWE

No CWE identifiers supplied.

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.