{"id":"CVE-2026-18171","aliases":["EUVD-2026-57236","GHSA-q3q4-c92f-m955"],"status":"published","title":"Docker Sandboxes read-only runtime mount writable through its shared-export alias","description":"Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.","severity":{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.0014,"percentile":0.03383,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-863"],"published":"2026-08-12T14:47:24Z","modified":"2026-10-23T20:10:00Z","products":[{"vendor":"docker","product":"docker sandboxes"}],"references":[{"url":"https://docs.docker.com/ai/sandboxes/","tags":["product"]},{"url":"https://docs.docker.com/ai/sandboxes/architecture/","tags":["product"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-18171"},{"url":"https://docs.docker.com/ai/sandboxes"},{"url":"https://docs.docker.com/ai/sandboxes/architecture"},{"url":"https://github.com/advisories/GHSA-q3q4-c92f-m955"}],"sources":{"cve":[{"id":"CVE-2026-18171","title":"Docker Sandboxes read-only runtime mount writable through its shared-export alias","description":"Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.","status":"published","published":"2026-08-12T14:47:24.572Z","modified":"2026-08-12T17:02:13.455Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"medium","assessor":"cna"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:20:12.60856Z"}],"euvd":[{"id":"EUVD-2026-57236","description":"Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.","status":"published","published":"2026-08-12T14:47:24Z","modified":"2026-08-12T17:02:13Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N","level":"medium"}],"updated_at":"2026-11-02T18:01:58.302106Z"}],"ghsa":[{"id":"GHSA-q3q4-c92f-m955","title":"Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest...","description":"Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.","status":"published","published":"2026-08-12T15:30:46Z","modified":"2026-08-12T15:30:46Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/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"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T15:10:22.744469Z"}],"nvd":[{"id":"CVE-2026-18171","description":"Docker Sandboxes (sbx) applies the read-only intent of a runtime host mount to the in-guest container bind only: the underlying virtio-fs host-edge grant is added to the sandbox's policy-share allowlist with no access mode. The directory stays writable at its shared-export path, so unprivileged code inside the sandbox can derive that path and write to a host directory the operator attached read-only.","status":"published","published":"2026-08-12T15:17:32.477Z","modified":"2026-10-23T20:10:00.16Z","cvss":[{"version":"4.0","score":5.7,"vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:H/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"}],"cwes":["CWE-863"],"updated_at":"2026-11-02T14:12:36.880938Z"}]}}