CVE-2026-105818

Vault PKI ACME Issues Certificate With Unvalidated SANs

State: Published
Severity: 5.9 Medium
Published: Oct 7, 2026
Updated: Oct 8, 2026
Reserved: Oct 5, 2026

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.

Scores

CVSS	Score	Vector	Source
3.1	5.9 Medium	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N	HashiCorp

Weaknesses

CWE-345 Insufficient Verification of Data Authenticity

Affected Products

Product	Versions
VaultHashiCorp	1.14.0 to before 2.1.2Affected
Vault EnterpriseHashiCorp	1.14.0 to before 2.1.2Affectedfrom 1.21.12Not affectedfrom 1.20.17Not affectedfrom 1.19.23Not affected

References

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

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