{"cve":"CVE-2026-94447","nvd":{"published":"2026-10-08T23:17:05.180","modified":"2026-10-15T16:18:24.170","status":"Awaiting Analysis","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.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","score":7.8},"cwes":["CWE-354"],"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"],"products":[],"source":"nvd","synced_at":"2026-10-19T22:58:01.639778232+00:00"},"epss":{"cve":"CVE-2026-94447","score":0.00102,"percentile":0.00927,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GO-2026-6602","url":"https://osv.dev/vulnerability/GO-2026-6602","summary":"Checksum database bypass for golang.org/toolchain in cmd/go","modified":"2026-10-16T09:55:44.518918993Z","packages":[{"ecosystem":"Go","name":"toolchain","purl":"pkg:golang/toolchain","ranges":["<1.26.9",">=1.27.0-0 <1.27.2"],"fixed":["1.26.9","1.27.2"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}