{"id":"CVE-2026-93317","state":"PUBLISHED","title":"Container blob cache can accept unverified content","description":"An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity.","publishedAt":"2026-10-05T17:43:44.903Z","updatedAt":"2026-10-05T19:06:09.645Z","severity":{"score":5.9,"label":"Medium","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N","source":"Docker"},"assigner":"Docker","products":["moby BuildKit"],"affected":[{"vendor":"moby","product":"BuildKit","packageName":"github.com/moby/buildkit","defaultStatus":"unaffected","versions":[{"version":"0.28.0","status":"affected","lessThan":"0.33.1","versionType":"semver"}]}],"references":["https://github.com/moby/buildkit/security/advisories/GHSA-p3rc-w3hc-pqvv","https://github.com/moby/buildkit/releases/tag/v0.33.1"],"weaknesses":["CWE-354"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93317.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93317","state":"PUBLISHED","datePublished":"2026-10-05T17:43:44.903Z","dateUpdated":"2026-10-05T19:06:09.645Z","assignerShortName":"Docker","assignerOrgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateReserved":"2026-09-17T17:17:43.718Z"},"containers":{"cna":{"title":"Container blob cache can accept unverified content","descriptions":[{"lang":"en","value":"An unauthenticated attacker controlling a registry or OCI-layout blob source could provide blob contents that did not match the claimed digest. The resulting snapshot could be cached under that digest and reused by a later victim build, compromising build-input integrity."}],"affected":[{"vendor":"moby","product":"BuildKit","packageName":"github.com/moby/buildkit","defaultStatus":"unaffected","versions":[{"version":"0.28.0","status":"affected","lessThan":"0.33.1","versionType":"semver"}]}],"references":[{"url":"https://github.com/moby/buildkit/security/advisories/GHSA-p3rc-w3hc-pqvv","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:N/AC:L/AT:P/PR:N/UI:A/VC:N/VI:H/VA:N/SC:N/SI:L/SA:N","baseScore":5.9,"baseSeverity":"MEDIUM","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","userInteraction":"ACTIVE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"HIGH","vulnAvailabilityImpact":"NONE","subConfidentialityImpact":"NONE","subIntegrityImpact":"LOW","subAvailabilityImpact":"NONE","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-354","description":"CWE-354: Improper Validation of Integrity Check Value","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"Docker","orgId":"686469e6-3ff6-451b-ab8b-cf5b9e89401e","dateUpdated":"2026-10-05T17:43:44.903Z"},"credits":[{"lang":"en","type":"finder","value":"He Wei (https://github.com/hewei-gikaku)"},{"lang":"en","type":"finder","value":"Haoxiang Yan (https://github.com/Yanhaoxi)"}],"source":{"discovery":"EXTERNAL"},"workarounds":[{"lang":"en","supportingMedia":[{"base64":false,"type":"text/html","value":"The issue only affects the low-level LLB API with direct blob access from the registry. It can't be reached with Dockerfile builds."}],"value":"The issue only affects the low-level LLB API with direct blob access from the registry. It can't be reached with Dockerfile builds."}]},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-05T19:05:59.752463Z","id":"CVE-2026-93317","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":"2026-10-05T19:06:09.645Z"}}]}}}