{"schema":"threatline.record/2","record":{"id":"CVE-2026-56857","aliases":[],"summary":"Root.Mkdir(All) can follow junctions out of the root on Windows in os","details":"On Windows, when the target of Root.Mkdir or Root.MkdirAll is a junction pointing to an empty location, the operation can create a directory at the junction target even when that target is located outside the root. This only applies to operations where the last path component is a junction (path/to/junction, but not path/junction/target).","categories":["Unclassified"],"product":"os","vendor":"Go standard library","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","source_modified_at":"2026-10-09T15:36:01.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"os","vendor":"Go standard library","versions":[{"version":"0","lessThan":"1.26.9","status":"affected","versionType":"semver"},{"version":"1.27.0-0","lessThan":"1.27.2","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","source_modified_at":"2026-10-09T15:36:01.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"internal/syscall/windows","vendor":"Go standard library","versions":[{"version":"0","lessThan":"1.26.9","status":"affected","versionType":"semver"},{"version":"1.27.0-0","lessThan":"1.27.2","status":"affected","versionType":"semver"}],"defaultStatus":"unaffected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","source_modified_at":"2026-10-09T15:36:01.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"os","ecosystem":null},"version":"1.26.9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","source_modified_at":"2026-10-09T15:36:01.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"os","ecosystem":null},"version":"1.27.2","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","source_modified_at":"2026-10-09T15:36:01.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"internal/syscall/windows","ecosystem":null},"version":"1.26.9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","source_modified_at":"2026-10-09T15:36:01.712Z","fetched_at":"2026-10-23T18:48:36.087640Z","package":{"name":"internal/syscall/windows","ecosystem":null},"version":"1.27.2","basis":"first unaffected version stated in the CVE record"}],"cvss":9.8,"severity":"Critical","kev":{"listed":false},"epss":{"probability":0.00493,"percentile":0.41474,"score_date":"2026-10-23"},"published_at":"2026-10-08T22:53:58.387Z","modified_at":"2026-10-09T15:36:01.712Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-56857","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-09T15:36:01.712Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-56857","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://go.dev/cl/847305"},{"source":"CVE List","url":"https://go.dev/issue/81739"},{"source":"CVE List","url":"https://groups.google.com/g/golang-announce/c/U2fTuyDJznI"},{"source":"CVE List","url":"https://pkg.go.dev/vuln/GO-2026-6604"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CISA ADP","ssvc":{"exploitation":"none","automatable":"yes","technical_impact":"total","assessed_at":"2026-10-09T15:35:58.663117Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-09T15:36:01.712Z","content_hash":"6459b2ee96ad52447feba5d112d4dca89f36673dcf914bb5b40759b6bcff734b"}}