CVE-2026-105820— Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution
Quick assessment
Affected
HashiCorp Vault Enterprise
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Vault 的 ACL 策略缓存中存在名称空间遍历漏洞，当策略名称包含路径遍历构造时即可触发此问题。该漏洞可能导致被分配了特制策略名称的令牌，能够使用其他名称空间（包括根名称空间）中定义的策略的能力。此漏洞（CVE-2026-105820）已在以下版本中修复：Vault Enterprise 2.1.2、1.21.12、1.20.17 和 1.19.23。Vault 社区版不支持名称空间，因此不受此漏洞影响。
Possible ATT&CK Techniques 1 AI
T1078.004 · Cloud Accounts
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I. Basic Information for CVE-2026-105820
Vulnerability Information
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Vulnerability Title
Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| HashiCorp | Vault Enterprise | 0.0.1 ~ 2.1.2 | - |
|
II. Public POCs for CVE-2026-105820
| # | POC Description | Source Link | Shenlong Link |
|---|
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Other References for CVE-2026-105820 (1)
Same Patch Batch · HashiCorp · 2026-10-07 · 4 CVEs total
| CVE-2026-105816 | 8.0 HIGH | Vault Vulnerable to Arbitrary Code Execution via Plugin Catalog Entries Restored From Raft |
| CVE-2026-89322 | 7.2 HIGH | Vault ACL Policy Evaluation May Allow Bypass of Deny Restrictions |
| CVE-2026-105818 | 5.9 MEDIUM | Vault PKI ACME Issues Certificate With Unvalidated SANs |
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V. Comments for CVE-2026-105820
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