CVE-2020-28366

An input validation vulnerability was found in Go. From a generated go file (from the cgo tool), it is possible to modify symbols within that object file and specify code. This flaw allows an attacker to create a repository that includes malicious pre-built object files that could execute arbitrary code when downloaded and run via go get or go build while building a Go project. The highest threat from this vulnerability is to confidentiality, integrity, as well as system availability.

Mitigation

If it's possible to confirm that the Go project being built does not rely on any cgo code in the included dependencies, the env variable CGO_ENABLED=0 can be specified when using either go get or go build.

For example:
CGO_ENABLED=0 go get github.com/someproject

This will not stop the files being downloaded but will stop any automatic complication of the cgo code, including inlined in the go file and separate .c files. Of course, this will only be effective if cgo is not relied upon in a given dependency and may not be appropriate in all scenarios.