{"id":"GO-2026-6602","summary":"Checksum database bypass for golang.org/toolchain in cmd/go","details":"Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/toolchain go.sum entry and operates a malicious GOMODPROXY the user chooses to use can bypass the intended checksum.\n\nWe now ensure that golang.org/toolchain always goes to the network for the canonical checksum.","aliases":["CVE-2026-94447"],"modified":"2026-10-08T23:00:13.625827930Z","published":"2026-10-08T22:31:09Z","database_specific":{"url":"https://pkg.go.dev/vuln/GO-2026-6602","review_status":"REVIEWED"},"references":[{"type":"FIX","url":"https://go.dev/cl/840785"},{"type":"REPORT","url":"https://go.dev/issue/81834"},{"type":"WEB","url":"https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"}],"affected":[{"package":{"name":"toolchain","ecosystem":"Go","purl":"pkg:golang/toolchain"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"1.26.9"},{"introduced":"1.27.0-0"},{"fixed":"1.27.2"}]}],"ecosystem_specific":{"imports":[{"path":"cmd/go"}]},"database_specific":{"source":"https://vuln.go.dev/ID/GO-2026-6602.json"}}],"schema_version":"1.9.0"}