Vulnerability Report: GO-2026-6180
- CVE-2026-56864
- Affects: cmd/go, golang.org/x/mod
- Published: Aug 13, 2026
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 Packages
-
PathVersionsSymbols
-
before go1.25.13, from go1.26.0-0 before go1.26.6, from go1.27.0-0 before go1.27.0-rc.3all symbols
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before v0.40.0
Aliases
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://vuln.go.dev/ID/GO-2026-6180.json
Credits
- mundur
Feedback
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