CVE-2025-4166

Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin

Description

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.

Category

4.5
CVSS
Severity: Medium
CVSS 3.1 •
EPSS 0.03%
Affected: HashiCorp Vault
Affected: HashiCorp Vault Enterprise
Published at:
Updated at:

References

Link Tags
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

Frequently Asked Questions

What is the severity of CVE-2025-4166?
CVE-2025-4166 has been scored as a medium severity vulnerability.
How to fix CVE-2025-4166?
To fix CVE-2025-4166, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2025-4166 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2025-4166 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2025-4166?
CVE-2025-4166 affects HashiCorp Vault, HashiCorp Vault Enterprise.
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