CVE-2026-105818 — Vault PKI ACME Issues Certificate With Unvalidated SANs

Description (CNA)

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 (CNA)

Vendor / product	Versions
HashiCorp / Vault	affected 1.14.0 before 2.1.2
HashiCorp / Vault Enterprise	affected 1.14.0 before 2.1.2

CWE

CWE-345

References

https://discuss.hashicorp.com/t/hcsec-2026-40-vault-pki-acme-default-directory-policy-may-issue-certificates-with-unverified-identities/77812

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.