{"id":"CVE-2026-105820","state":"PUBLISHED","title":"Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution","description":"Vault's ACL policy cache allowed namespace traversal when policy names contained path traversal constructs. This may allow a token assigned specially crafted policy names to use the capabilities of policies defined in other namespaces, including the root namespace. This vulnerability (CVE-2026-105820) is fixed in Vault Enterprise 2.1.2, 1.21.12, 1.20.17, and 1.19.23. Vault Community Edition does not support namespaces, and is not affected.","publishedAt":"2026-10-07T21:48:08.017Z","updatedAt":"2026-10-08T17:06:15.663Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"HashiCorp"},"assigner":"HashiCorp","products":["HashiCorp Vault Enterprise"],"affected":[{"vendor":"HashiCorp","product":"Vault Enterprise","defaultStatus":"unaffected","versions":[{"version":"0.0.1","status":"affected","lessThan":"2.1.2","changes":[{"at":"1.21.12","status":"unaffected"},{"at":"1.20.17","status":"unaffected"},{"at":"1.19.23","status":"unaffected"}],"versionType":"semver"}],"platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"]}],"references":["https://discuss.hashicorp.com/t/hcsec-2026-42-vault-enterprise-acl-policy-cache-vulnerable-to-cross-namespace-policy-resolution/77814"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:10:23.711Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/105xxx/CVE-2026-105820.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-105820","state":"PUBLISHED","datePublished":"2026-10-07T21:48:08.017Z","dateUpdated":"2026-10-08T17:06:15.663Z","assignerShortName":"HashiCorp","assignerOrgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","dateReserved":"2026-10-05T21:35:14.384Z"},"containers":{"cna":{"title":"Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution","descriptions":[{"lang":"en","value":"Vault's ACL policy cache allowed namespace traversal when policy names contained path traversal constructs. This may allow a token assigned specially crafted policy names to use the capabilities of policies defined in other namespaces, including the root namespace. This vulnerability (CVE-2026-105820) is fixed in Vault Enterprise 2.1.2, 1.21.12, 1.20.17, and 1.19.23. Vault Community Edition does not support namespaces, and is not affected."}],"affected":[{"vendor":"HashiCorp","product":"Vault Enterprise","defaultStatus":"unaffected","versions":[{"version":"0.0.1","status":"affected","lessThan":"2.1.2","changes":[{"at":"1.21.12","status":"unaffected"},{"at":"1.20.17","status":"unaffected"},{"at":"1.19.23","status":"unaffected"}],"versionType":"semver"}],"platforms":["64 bit","32 bit","x86","ARM","MacOS","Windows","Linux"]}],"references":[{"url":"https://discuss.hashicorp.com/t/hcsec-2026-42-vault-enterprise-acl-policy-cache-vulnerable-to-cross-namespace-policy-resolution/77814"}],"metrics":[{"cvssV3_1":{"baseScore":5.4,"baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","version":"3.1"},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory (Path Traversal)","lang":"en","type":"CWE"}]}],"providerMetadata":{"shortName":"HashiCorp","orgId":"67fedba0-ff2e-4543-ba5b-aa93e87718cc","dateUpdated":"2026-10-07T21:48:08.017Z"},"credits":[{"lang":"en","value":"This issue was identified by an external party."}],"impacts":[{"capecId":"CAPEC-126","descriptions":[{"lang":"en","value":"CAPEC-126: Path Traversal"}]}],"source":{"advisory":"HCSEC-2026-42","discovery":"EXTERNAL"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-08T17:05:54.369098Z","id":"CVE-2026-105820","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":"2026-10-08T17:06:15.663Z"}}]}}}