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    CVE-2026-105818

    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.

    Published:Oct 7, 2026
    Last Modified:Oct 8, 2026
    EPS:Oct 7, 2026
    EPSS Score:0.0008
    CVSS Score:5.9

    Affected Products

    Vendor
    Hashicorp
    Product
    Vault
    Vendor
    Hashicorp
    Product
    Vault Enterprise

    Exploits

    No exploit reference

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    CVE-2026-5052 (CVSS 5.3) — Vault’s PKI engine’s ACME validation did not reject local targets when issuing http-01 and tls-alpn-01 challen…
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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High