{"id":"GO-2026-6601","aliases":["BIT-golang-2026-94444","CVE-2026-94444"],"title":"Checksum bypass for golang.org/fips140 in cmd/go","titleSource":"OSV","descriptionSource":"OSV","description":"Previously, a user operating inside of a malicious Go project that defines a bogus golang.org/fips140 and operates a malicious GOMODPROXY the user chooses to connect to can serve an arbitrary module in its place.\n\nWe now unpack the trusted ziphash for the bundled golang.org/fips140 module and construct its entry in the GOMODCACHE such that it can be verified by the toolchain.","severity":"unknown","score":null,"published":"2026-10-08T22:31:09.000Z","modified":"2026-11-14T13:12:13.661Z","withdrawn":false,"knownExploited":false,"affected":[{"ecosystem":"Go","name":"toolchain","sources":[{"name":"OSV · GO-2026-6601","url":"https://osv.dev/vulnerability/GO-2026-6601"}],"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/840685","https://go.dev/issue/81833","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"],"sources":[{"name":"OSV","id":"GO-2026-6601","modified":"2026-11-14T13:12:13.661275021Z","url":"https://osv.dev/vulnerability/GO-2026-6601"}],"assessments":[],"products":[],"remediation":[],"observedAt":"2026-11-14T15:04:59.325Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:10:31.937Z"},"coverage":[{"source":"NVD","status":"refresh-failed","attemptedAt":"2026-11-14T00:45:31.685Z"},{"source":"GHSA","status":"available","checkedAt":"2026-11-14T00:35:33.583Z","attemptedAt":"2026-11-14T00:35:33.583Z"},{"source":"EUVD","status":"available","checkedAt":"2026-11-14T00:35:34.868Z","attemptedAt":"2026-11-14T00:35:34.868Z"},{"source":"EPSS","status":"available","checkedAt":"2026-11-14T00:35:33.463Z","attemptedAt":"2026-11-14T00:35:33.463Z"}],"evidence":[{"source":"FIRST EPSS","id":"CVE-2026-94444","url":"https://www.first.org/epss/","probability":0.00097,"percentile":0.00741,"date":"2026-11-13","checkedAt":"2026-11-14T00:35:33.463Z"},{"source":"GitHub Advisory Database","id":"GHSA-2f4j-3hgj-v9j7","url":"https://github.com/advisories/GHSA-2f4j-3hgj-v9j7","modified":"2026-10-15T18:32:44Z","score":7.8,"vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","checkedAt":"2026-11-14T00:35:33.583Z"},{"source":"ENISA EUVD","id":"EUVD-2026-95417","url":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-95417","modified":"Oct 15, 2026, 3:33:40 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":"2026-11-14T00:35:34.868Z"}],"aiSummary":null}