{"id":"CVE-2026-15788","aliases":["BELL-CVE-2026-15788","EUVD-2026-46074","GHSA-388v-wmr2-g2v2","RHSA-2026:43122","RHSA-2026:44152","RHSA-2026:46988","RHSA-2026:51065"],"status":"published","title":"WCOW cache mount source selector resolves NTFS junctions outside of cache root","description":"BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.","severity":{"version":"4.0","score":5.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00411,"percentile":0.35824,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-59"],"published":"2026-07-20T19:12:56Z","modified":"2026-10-28T02:31:06Z","affected":[{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"buildah","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.44.0-3.2.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"buildah-tests","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.44.0-3.2.hum1"}]}],"bundled":2},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"podman","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:6.0.2-2.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"podman-docker","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:6.0.2-2.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"podman-machine","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:6.0.2-2.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"podman-remote","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:6.0.2-2.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"podman-tests","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:6.0.2-2.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"podmansh","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:6.0.2-2.1.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"trivy","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:0.72.0-0.1.2.hum1"}]}],"bundled":3},{"source":"osv","ecosystem":"Red Hat:hummingbird:1","package":"buildah","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0:1.45.0-2.hum1"}]}],"bundled":4}],"products":[{"vendor":"moby","product":"buildkit"},{"vendor":"mobyproject","product":"buildkit"}],"references":[{"url":"https://github.com/moby/buildkit/security/advisories/GHSA-388v-wmr2-g2v2","tags":["vendor-advisory","Vendor Advisory","advisory","article"]},{"url":"https://docs.bell-sw.com/security/cves/CVE-2026-15788","tags":["advisory"]},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/15xxx/CVE-2026-15788.json","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15788","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:43122","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-15788","tags":["report"]},{"url":"https://access.redhat.com/security/updates/classification/","tags":["article"]},{"url":"https://images.redhat.com/","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-15792","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_43122.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2502989","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-15788","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2503746","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-15792","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15792","tags":["advisory"]},{"url":"https://github.com/moby/buildkit/security/advisories/GHSA-qx3x-mv6r-52p6","tags":["article"]},{"url":"https://access.redhat.com/errata/RHSA-2026:44152","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-56852","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_44152.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2504233","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-56852","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-56852","tags":["advisory"]},{"url":"https://go.dev/cl/794100","tags":["article"]},{"url":"https://go.dev/issue/80142","tags":["article"]},{"url":"https://pkg.go.dev/vuln/GO-2026-5970","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:46988","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_46988.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2026:51065","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-75593","tags":["report"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-15789","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_51065.json","tags":["advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2503742","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-15789","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-15789","tags":["advisory"]},{"url":"https://github.com/moby/buildkit/security/advisories/GHSA-g2h8-426c-7976","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2519913","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-75593","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75593","tags":["advisory"]},{"url":"https://github.com/moby/buildkit/releases/tag/v0.31.2","tags":["article"]}],"sources":{"cve":[{"id":"CVE-2026-15788","title":"WCOW cache mount source selector resolves NTFS junctions outside of cache root","description":"BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.","status":"published","published":"2026-07-20T19:12:56.386Z","modified":"2026-07-21T12:40:56.055Z","cvss":[{"version":"4.0","score":5.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T13:47:51.033687Z"}],"euvd":[{"id":"EUVD-2026-46074","description":"BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.","status":"published","published":"2026-07-20T19:12:56Z","modified":"2026-07-21T12:40:56Z","cvss":[{"version":"4.0","score":5.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:19:47.436242Z"}],"nvd":[{"id":"CVE-2026-15788","description":"BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.","status":"published","published":"2026-07-20T20:16:43.223Z","modified":"2026-10-24T20:10:00.137Z","cvss":[{"version":"4.0","score":5.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X","level":"medium","assessor":"secondary"},{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high","assessor":"primary"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T14:12:31.024898Z"}],"osv":[{"id":"BELL-CVE-2026-15788","title":"CVE-2026-15788 does not affect BellSoft software","status":"withdrawn","published":"2026-08-03T22:28:11.627443Z","modified":"2026-08-11T07:15:05.205951459Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","level":"high"}],"updated_at":"2026-11-02T15:28:23.037038Z"},{"id":"CVE-2026-15788","title":"WCOW cache mount source selector resolves NTFS junctions outside of cache root","description":"BuildKit's cache mount source= selector on Windows Container on Windows (WCOW) workers does not detect NTFS directory junctions placed inside the cache root. A build authored by an untrusted user on a WCOW-configured BuildKit daemon can read arbitrary host files reachable to the BuildKit daemon process.","status":"published","published":"2026-07-20T19:12:56.386Z","modified":"2026-10-28T02:31:06.963394308Z","cvss":[{"version":"4.0","score":5.6,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"cwes":["CWE-59"],"updated_at":"2026-11-02T15:44:57.682091Z"},{"id":"RHSA-2026:43122","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-06T10:12:33Z","modified":"2026-10-20T10:09:10Z","cvss":[{"version":"3.1","score":6.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","level":"medium"}],"updated_at":"2026-11-02T15:53:20.491441Z"},{"id":"RHSA-2026:44152","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-06T10:12:46Z","modified":"2026-10-20T10:09:26Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:20.491441Z"},{"id":"RHSA-2026:46988","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-06T10:13:02Z","modified":"2026-10-20T10:09:45Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:20.984762Z"},{"id":"RHSA-2026:51065","title":"Red Hat Security Advisory: Red Hat Hardened Images RPMs Security Update","status":"published","published":"2026-08-07T10:28:37Z","modified":"2026-10-20T10:10:34Z","cvss":[{"version":"3.1","score":7.5,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:20.984762Z"}]}}