{"id":"CVE-2026-93320","state":"PUBLISHED","title":"BuildKit improperly handles special files in build snapshots","description":"BuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access.","publishedAt":"2026-10-05T17:50:44.195Z","updatedAt":"2026-10-05T18:52:25.223Z","severity":{"score":6,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H","source":"Docker"},"assigner":"Docker","products":["moby BuildKit"],"affected":[{"vendor":"moby","product":"BuildKit","packageName":"github.com/moby/buildkit","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.33.0","versionType":"semver"}]}],"references":["https://github.com/moby/buildkit/security/advisories/GHSA-9728-qjrv-2xh2","https://github.com/moby/buildkit/releases/tag/v0.33.1"],"weaknesses":["CWE-441"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93320.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93320","state":"PUBLISHED","datePublished":"2026-10-05T17:50:44.195Z","dateUpdated":"2026-10-05T18:52:25.223Z","assignerShortName":"Docker","assignerOrgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateReserved":"2026-09-17T17:18:00.217Z"},"containers":{"cna":{"title":"BuildKit improperly handles special files in build snapshots","descriptions":[{"lang":"en","value":"BuildKit may be tricked into performing file actions with special file inodes where regular files are expected. Special files may block operations or, on rootful workers, allow unintended host device access."}],"affected":[{"vendor":"moby","product":"BuildKit","packageName":"github.com/moby/buildkit","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.33.0","versionType":"semver"}]}],"references":[{"url":"https://github.com/moby/buildkit/security/advisories/GHSA-9728-qjrv-2xh2","tags":["vendor-advisory"]},{"url":"https://github.com/moby/buildkit/releases/tag/v0.33.1","tags":["patch"]}],"metrics":[{"cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:L/SC:N/SI:H/SA:H","baseScore":6,"baseSeverity":"MEDIUM","attackVector":"LOCAL","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"LOW","vulnAvailabilityImpact":"LOW","subConfidentialityImpact":"NONE","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-441","description":"CWE-441: Unintended Proxy or Intermediary ('Confused Deputy')","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Docker","orgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateUpdated":"2026-10-05T17:50:44.195Z"},"credits":[{"lang":"en","type":"finder","value":"Daniele Linguaglossa (https://github.com/dzonerzy)"}],"source":{"discovery":"EXTERNAL"},"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"<p>Avoid untrusted builds. Rootless mode mitigates device access but not denial of service.</p>"}],"value":"Avoid untrusted builds. Rootless mode mitigates device access but not denial of service."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-05T18:52:01.509494Z","id":"CVE-2026-93320","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-05T18:52:25.223Z"}}]}}}