Vulnerability · Published Oct 7, 2026 · Assigned by HashiCorp
CVE-2026-105818Vault PKI ACME Issues Certificate With Unvalidated SANs
Medium 5.9
In plain English
A medium-severity insufficient verification of data authenticity in Vault from HashiCorp. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 0% of all known vulnerabilities).
Official 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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| HashiCorp | Vault | 1.14.0 – before 2.1.2 |
| HashiCorp | Vault Enterprise | 1.14.0 – before 2.1.2 |
Weakness: CWE-345 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N