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CVE-2025-4166

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Date: May 2, 2025

Vault Community and Vault Enterprise Key/Value (kv) Version 2 plugin may unintentionally expose sensitive information in server and audit logs when users submit malformed payloads during secret creation or update operations via the Vault REST API. This vulnerability, identified as CVE-2025-4166, is fixed in Vault Community 1.19.3 and Vault Enterprise 1.19.3, 1.18.9, 1.17.16, 1.16.20.

Severity Score

Related Resources (6)

https://nvd.nist.gov/vuln/detail/CVE-2025-4166
https://discuss.hashicorp.com/t/hcsec-2025-09-vault-may-expose-sensitive-information-in-error-logs-when-processing-malformed-data-with-the-kv-v2-plugin
https://github.com/hashicorp/vault
https://pkg.go.dev/vuln/GO-2025-3663
https://github.com/advisories/GHSA-gcqf-f89c-68hv
https://www.mend.io/vulnerability-database/CVE-2025-4166

Severity Score

Weakness Type (CWE)

Generation of Error Message Containing Sensitive Information

CWE-209

Top Fix

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Upgrade to version github.com/hashicorp/vault - v1.19.3

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): HIGH
User Interaction (UI): REQUIRED
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): NONE
Availability (A): NONE

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