CVE-2026-105818
Medium
Description
Vault's PKI secrets engine ACME server did not restrict certificate identities that ACME challenges do not validate when issuing certificates under the default directory policy. This may allow an ACME client to obtain a certificate containing unverified identity claims, potentially enabling impersonation toward systems that trust certificates issued by the affected Vault PKI mount. This vulnerability (CVE-2026-105818) is fixed in Vault Community Edition 2.1.2, and Vault Enterprise 2.1.2, 1.21.12, 1.20.17, and 1.19.23.
SeverityMedium
CVSS5.9
Exploit probability—
Product
Vault
PublishedOct 7, 2026
First seenOct 7, 2026
Weakness typeCWE-345CWE-345
How to fix
Update
- HashiCorp Vault2.1.2 or later
- HashiCorp Vault Enterprise2.1.2 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| HashiCorp Vault | 1.14.0 ≤ v < 2.1.2 | 2.1.2 |
| HashiCorp Vault Enterprise | 1.14.0 ≤ v < 2.1.2 | 2.1.2 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.