Vulnerability Monitor

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CVE-2025-4166

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.

Published

2025-05-02T15:15:50.313

Last Modified

2025-08-12T01:44:28.067

Status

Undergoing Analysis

Source

[email protected]

Severity

CVSSv3.1: 4.5 (MEDIUM)

Weaknesses

Type: Secondary
CWE-209

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	hashicorp	vault	< 1.16.20	Yes
Application	hashicorp	vault	< 1.19.3	Yes
Application	hashicorp	vault	< 1.17.16	Yes
Application	hashicorp	vault	< 1.18.9	Yes
Application	hashicorp	vault	< 1.19.3	Yes

References

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 Vendor Advisory ([email protected])