{"id":"CVE-2026-77179","state":"PUBLISHED","title":"Docker Sandboxes guest can write arbitrary macOS host files via a symlink in the virtio-fs stored-path fallback","description":"On macOS, the virtio-fs host server used by Docker Sandboxes improperly follows symlinks when reopening an unlinked file from a stored path. A malicious guest can replace a parent directory with a symlink, escape the shared workspace, and read or modify arbitrary host files as the VMM user, potentially achieving host code execution.","publishedAt":"2026-09-15T13:32:41.132Z","updatedAt":"2026-09-15T21:43:07.049Z","severity":{"score":9.4,"label":"Critical","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","source":"Docker"},"assigner":"Docker","products":["Docker Docker Sandboxes"],"affected":[{"vendor":"Docker","product":"Docker Sandboxes","defaultStatus":"unaffected","versions":[{"version":"0.28.0","status":"affected","lessThan":"0.42.0","versionType":"semver"}],"platforms":["MacOS"],"cpes":["cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*"]}],"references":["https://docs.docker.com/ai/sandboxes/","https://docs.docker.com/ai/sandboxes/security/isolation/","https://github.com/docker/sbx-releases/releases/tag/v0.42.0"],"weaknesses":["CWE-59"],"ingestedAt":"2026-10-29T20:13:07.220Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/77xxx/CVE-2026-77179.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-77179","state":"PUBLISHED","datePublished":"2026-09-15T13:32:41.132Z","dateUpdated":"2026-09-15T21:43:07.049Z","assignerShortName":"Docker","assignerOrgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateReserved":"2026-08-20T15:32:02.935Z"},"containers":{"cna":{"title":"Docker Sandboxes guest can write arbitrary macOS host files via a symlink in the virtio-fs stored-path fallback","descriptions":[{"lang":"en","value":"On macOS, the virtio-fs host server used by Docker Sandboxes improperly follows symlinks when reopening an unlinked file from a stored path. A malicious guest can replace a parent directory with a symlink, escape the shared workspace, and read or modify arbitrary host files as the VMM user, potentially achieving host code execution."}],"affected":[{"vendor":"Docker","product":"Docker Sandboxes","defaultStatus":"unaffected","versions":[{"version":"0.28.0","status":"affected","lessThan":"0.42.0","versionType":"semver"}],"platforms":["MacOS"],"cpes":["cpe:2.3:a:docker:docker_sandboxes:*:*:*:*:*:*:*:*"]}],"references":[{"url":"https://docs.docker.com/ai/sandboxes/","tags":["product"]},{"url":"https://docs.docker.com/ai/sandboxes/security/isolation/","tags":["product"]},{"url":"https://github.com/docker/sbx-releases/releases/tag/v0.42.0","tags":["release-notes"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H","baseScore":9.4,"baseSeverity":"CRITICAL","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"HIGH","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"HIGH","subIntegrityImpact":"HIGH","subAvailabilityImpact":"HIGH","Automatable":"NOT_DEFINED","Recovery":"NOT_DEFINED","Safety":"NOT_DEFINED","valueDensity":"NOT_DEFINED","vulnerabilityResponseEffort":"NOT_DEFINED","providerUrgency":"NOT_DEFINED","exploitMaturity":"NOT_DEFINED"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-59","description":"CWE-59: Improper Link Resolution Before File Access ('Link Following')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Docker","orgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateUpdated":"2026-09-15T21:43:07.049Z"},"credits":[{"lang":"en","type":"finder","value":"Oren Yomtov of accomplish.ai"}],"impacts":[{"capecId":"CAPEC-132","descriptions":[{"lang":"en","value":"CAPEC-132 Symlink Attack"}]}],"source":{"discovery":"EXTERNAL"},"workarounds":[{"lang":"en","value":"Use --clone mode and avoid additional read-write host mounts: https://docs.docker.com/ai/sandboxes/usage/#clone-mode"}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-09-15T15:00:58.602243Z","id":"CVE-2026-77179","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-09-15T15:01:06.221Z"}}]}}}