Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution

{
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  "dataVersion": "5.2",
  "cveMetadata": {
    "cveId": "CVE-2026-105820",
    "assignerOrgId": "67fedba0-ff2e-4543-ba5b-aa93e87718cc",
    "assignerShortName": "HashiCorp",
    "dateUpdated": "2026-10-08T17:06:15.663Z",
    "dateReserved": "2026-10-05T21:35:14.384Z",
    "datePublished": "2026-10-07T21:48:08.017Z",
    "state": "PUBLISHED"
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  "containers": {
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        "orgId": "67fedba0-ff2e-4543-ba5b-aa93e87718cc",
        "shortName": "HashiCorp",
        "dateUpdated": "2026-10-07T21:48:08.017Z"
      },
      "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.",
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              "value": "<p>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.</p><br/>"
            }
          ]
        }
      ],
      "affected": [
        {
          "vendor": "HashiCorp",
          "product": "Vault Enterprise",
          "platforms": [
            "64 bit",
            "32 bit",
            "x86",
            "ARM",
            "MacOS",
            "Windows",
            "Linux"
          ],
          "defaultStatus": "unaffected",
          "versions": [
            {
              "version": "0.0.1",
              "status": "affected",
              "versionType": "semver",
              "lessThan": "2.1.2"
            }
          ]
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "lang": "en",
              "description": "CWE-22: Improper Limitation of a Pathname to a Restricted Directory (Path Traversal)",
              "cweId": "CWE-22",
              "type": "CWE"
            }
          ]
        }
      ],
      "references": [
        {
          "url": "https://discuss.hashicorp.com/t/hcsec-2026-42-vault-enterprise-acl-policy-cache-vulnerable-to-cross-namespace-policy-resolution/77814"
        }
      ],
      "impacts": [
        {
          "capecId": "CAPEC-126",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-126: Path Traversal"
            }
          ]
        }
      ],
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
            "baseScore": 5.4,
            "baseSeverity": "MEDIUM"
          }
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "This issue was identified by an external party."
        }
      ]
    },
    "adp": [
      {
        "providerMetadata": {
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP",
          "dateUpdated": "2026-10-08T17:06:15.663Z"
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        "title": "CISA ADP Vulnrichment",
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