What’s Vulnerable › Vulnerabilities
CVE-2026-105820: Vault ACL Policy Cache Vulnerable to Cross-Namespace Policy Resolution
- Severity: medium (CVSS 5.4 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 0.2% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2026-10-07 · updated 2026-10-08
- Weakness: CWE-22
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.
Affected products
- HashiCorp Vault: from 0.0.1 before 2.1.2 — fixed in 2.1.2
How to fix
Upgrade to a fixed version: HashiCorp Vault 2.1.2. Check the vendor advisory for mitigations.
References
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