CVE-2026-105820

Status: Awaiting AnalysisMedium (5.4)—

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.

CVSS

Version: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Base score: 5.4

Exploitation probability (EPSS)

Probability of exploitation in the next 30 days: 0.25%
Percentile among all scored CVEs: 15
Score date: 10/13/2026

EPSS (Exploit Prediction Scoring System, FIRST) estimates how likely a vulnerability is to be exploited in the wild within 30 days. It complements CVSS (impact) and CISA KEV (confirmed exploitation).

🎯 ATT&CK techniques

How this vulnerability is exploited and what the attacker gains, in MITRE ATT&CK terms.

ExploitationT1210 Exploitation of Remote Serviceslateral movement75 %
Primary impactT1005 Data from Local Systemcollection70 %
Secondary impactT1078.001 Default Accountsstealth · persistence · privilege escalation · initial access65 %

Vulnerabilidad de traversal (CWE-22) en servicio remoto (Vault) que requiere token válido (PR:L). Token con políticas manipuladas accede a datos/políticas de otros namespaces, incluyendo root.

Inferred by our analysis agent from the official description, CVSS vector and CWE, and checked by a supervisor. May contain errors.

🛡️ ATT&CK mitigations that cover these techniques

Vulnerability Scanning Threat Intelligence Program Privileged Account Management Password Policies Network Segmentation Multi-factor Authentication

Affected technologies (1)

⚠ AI-inferred from the description — NVD hasn't analyzed this CVE yet, these aren't verified CPEs.

Hashicorp — Vault^AI

CWEs

CWE-22

References

https://discuss.hashicorp.com/t/hcsec-2026-42-vault-enterprise-acl-policy-cache-vulnerable-to-cross-namespace-policy-resolution/77814

Raw JSON (NVD)

Show

{
  "id": "CVE-2026-105820",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2026-105820",
          "role": "CISA Coordinator",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "version": "2.0.3",
          "timestamp": "2026-10-08T17:05:54.369098Z"
        }
      }
    ],
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "security@hashicorp.com",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.4,
          "attackVector": "NETWORK",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
          "integrityImpact": "LOW",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "NONE",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "LOW"
        },
        "impactScore": 2.5,
        "exploitabilityScore": 2.8
      }
    ]
  },
  "affected": [
    {
      "source": "security@hashicorp.com",
      "affectedData": [
        {
          "vendor": "HashiCorp",
          "product": "Vault Enterprise",
          "versions": [
            {
              "status": "affected",
              "changes": [
                {
                  "at": "1.21.12",
                  "status": "unaffected"
                },
                {
                  "at": "1.20.17",
                  "status": "unaffected"
                },
                {
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              ],
              "version": "0.0.1",
              "lessThan": "2.1.2",
              "versionType": "semver"
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          ],
          "platforms": [
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            "32 bit",
            "x86",
            "ARM",
            "MacOS",
            "Windows",
            "Linux"
          ],
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        }
      ]
    }
  ],
  "published": "2026-10-07T22:17:02.990",
  "references": [
    {
      "url": "https://discuss.hashicorp.com/t/hcsec-2026-42-vault-enterprise-acl-policy-cache-vulnerable-to-cross-namespace-policy-resolution/77814",
      "source": "security@hashicorp.com"
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  ],
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
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      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
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  ],
  "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."
    }
  ],
  "lastModified": "2026-10-08T21:07:57.460",
  "sourceIdentifier": "security@hashicorp.com"
}