{"id":"CVE-2026-94447","state":"PUBLISHED","title":"Checksum database bypass for golang.org/toolchain in cmd/go","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. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum.","publishedAt":"2026-10-08T22:53:57.974Z","updatedAt":"2026-10-15T15:42:37.164Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","source":"CISA-ADP"},"assigner":"Go","products":["Go toolchain cmd/go"],"affected":[{"vendor":"Go toolchain","product":"cmd/go","packageName":"cmd/go","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.26.9","versionType":"semver"},{"version":"1.27.0-0","status":"affected","lessThan":"1.27.2","versionType":"semver"}],"collectionURL":"https://pkg.go.dev"}],"references":["https://go.dev/cl/840785","https://go.dev/issue/81834","https://groups.google.com/g/golang-announce/c/U2fTuyDJznI","https://pkg.go.dev/vuln/GO-2026-6602"],"weaknesses":["CWE-354"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/94xxx/CVE-2026-94447.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-94447","state":"PUBLISHED","datePublished":"2026-10-08T22:53:57.974Z","dateUpdated":"2026-10-15T15:42:37.164Z","assignerShortName":"Go","assignerOrgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateReserved":"2026-09-21T16:43:04.757Z"},"containers":{"cna":{"title":"Checksum database bypass for golang.org/toolchain in cmd/go","descriptions":[{"lang":"en","value":"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. We now ensure that golang.org/toolchain always goes to the network for the canonical checksum."}],"affected":[{"vendor":"Go toolchain","product":"cmd/go","packageName":"cmd/go","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThan":"1.26.9","versionType":"semver"},{"version":"1.27.0-0","status":"affected","lessThan":"1.27.2","versionType":"semver"}],"collectionURL":"https://pkg.go.dev"}],"references":[{"url":"https://go.dev/cl/840785"},{"url":"https://go.dev/issue/81834"},{"url":"https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"},{"url":"https://pkg.go.dev/vuln/GO-2026-6602"}],"problemTypes":[{"descriptions":[{"lang":"en","description":"CWE-354: Improper Validation of Integrity Check Value"}]}],"providerMetadata":{"shortName":"Go","orgId":"1bb62c36-49e3-4200-9d77-64a1400537cc","dateUpdated":"2026-10-08T22:53:57.974Z"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":7.8,"attackVector":"LOCAL","baseSeverity":"HIGH","vectorString":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","integrityImpact":"HIGH","userInteraction":"REQUIRED","attackComplexity":"LOW","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"HIGH"}},{"other":{"type":"ssvc","content":{"timestamp":"2026-10-15T15:42:26.460826Z","id":"CVE-2026-94447","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-354","type":"CWE","lang":"en","description":"CWE-354 Improper Validation of Integrity Check Value"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-15T15:42:37.164Z"}}]}}}