Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution

{
  "id": "2310e7dfa32e536931267cd7efff03efa6ec70e8ac6eeddeb3403750a92809db",
  "url": "https://osv.dev/vulnerability/BIT-vault-2026-105820",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution",
    "summary": "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.",
    "evidence": "osv:BIT-vault-2026-105820",
    "products": [
      {
        "name": {
          "value": "vault",
          "evidence": "/affected/0/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "1.19.23",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "1.20.17",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "1.21.12",
            "evidence": "/affected/0/ranges"
          },
          {
            "value": "2.1.2",
            "evidence": "/affected/0/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "medium",
    "structured": {
      "id": "BIT-vault-2026-105820",
      "aliases": [
        "BIT-vault-2026-105820",
        "CVE-2026-105820"
      ],
      "affected": [
        {
          "ranges": [
            {
              "type": "SEMVER",
              "events": [
                {
                  "introduced": "0.0.1"
                },
                {
                  "fixed": "1.19.23"
                },
                {
                  "introduced": "1.20.0"
                },
                {
                  "fixed": "1.20.17"
                },
                {
                  "introduced": "1.21.0"
                },
                {
                  "fixed": "1.21.12"
                },
                {
                  "introduced": "2.0.0"
                },
                {
                  "fixed": "2.1.2"
                }
              ]
            }
          ],
          "package": {
            "name": "vault",
            "purl": "pkg:bitnami/vault",
            "ecosystem": "Bitnami"
          },
          "severity": [
            {
              "type": "CVSS_V3",
              "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N"
            }
          ],
          "database_specific": {
            "source": "https://github.com/bitnami/vulndb/tree/main/data/vault/BIT-vault-2026-105820.json"
          }
        }
      ],
      "modified": "2026-10-16T09:45:23.803715183Z",
      "provider": "osv",
      "references": [
        "https://discuss.hashicorp.com/t/hcsec-2026-42-vault-enterprise-acl-policy-cache-vulnerable-to-cross-namespace-policy-resolution/77814",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-105820"
      ],
      "provider_metadata": {
        "cpes": [
          "cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:go:*:*"
        ],
        "severity": "Medium"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-105820",
        "evidence": "/aliases"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/database_specific/severity"
  },
  "source_id": "core-osv",
  "document_id": 338427,
  "published_at": "2026-10-16T08:47:46.214+00:00"
}