Credentials provided via the new GOAUTH feature were not being properly segmented by domain, allowing a malicious server to request credentials they should not have access to. By default, unless otherwise set, this only affected credentials stored in the users .netrc file.
https://pkg.go.dev/vuln/GO-2025-3383
https://groups.google.com/g/golang-dev/c/CAWXhan3Jww/m/bk9LAa-lCgAJ