{"id":"GO-2026-6602","aliases":["BIT-golang-2026-94447","CVE-2026-94447"],"title":"Checksum database bypass for golang.org/toolchain in cmd/go","titleSource":"OSV","descriptionSource":"OSV","description":"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.","severity":"unknown","score":null,"published":"2026-10-08T22:31:09.000Z","modified":"2026-11-14T13:12:14.141Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"toolchain","sources":[{"name":"OSV · GO-2026-6602","url":"https://osv.dev/vulnerability/GO-2026-6602"}],"ranges":[{"events":[{"introduced":"0"},{"fixed":"1.26.9"},{"introduced":"1.27.0-0"},{"fixed":"1.27.2"}],"type":"SEMVER"}],"versions":[],"fixed":["1.26.9","1.27.2"]}],"sourceAffected":[],"references":["https://go.dev/cl/840785","https://go.dev/issue/81834","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"],"sources":[{"name":"OSV","id":"GO-2026-6602","modified":"2026-11-14T13:12:14.141810781Z","url":"https://osv.dev/vulnerability/GO-2026-6602"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:04:28.531Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T01:30:33.103Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T00:20:34.021Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T00:10:34.097Z","attemptedAt":"2026-11-14T00:10:34.097Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T00:10:34.836Z","attemptedAt":"2026-11-14T00:10:34.836Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T00:10:34.221Z","attemptedAt":"2026-11-14T00:10:34.221Z"}],"evidence":[{"source":"GitHub Advisory Database","id":"GHSA-cgx4-3g64-rvr7","url":"https://github.com/advisories/GHSA-cgx4-3g64-rvr7","modified":"2026-10-15T18:32:45Z","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","checkedAt":"2026-11-14T00:10:34.097Z"},{"source":"FIRST EPSS","id":"CVE-2026-94447","url":"https://www.first.org/epss/","probability":0.00102,"percentile":0.00943,"date":"2026-11-13","checkedAt":"2026-11-14T00:10:34.221Z"},{"source":"ENISA EUVD","id":"EUVD-2026-95418","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95418","modified":"Oct 15, 2026, 3:42:37 PM","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","checkedAt":"2026-11-14T00:10:34.836Z"}],"aiSummary":null}