CVE-2026-105818: Hashicorp Vault

Medium severity, CVSS 5.9. EPSS: 0.1% chance of exploitation in the next 30 days.

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.

Affected products

• Hashicorp Vault: from 1.14.0, before 2.1.2 (fixed in 2.1.2)
• Hashicorp Vault Enterprise: from 1.14.0, before 2.1.2 (fixed in 2.1.2)

Published 2026-10-07. Last modified 2026-10-08.