# CVE-2025-4166: Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin

> CVE-2025-4166: Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin. CVSS 4.5 (CVSS 3.1).

Canonical: https://rewindex.com/cve/CVE-2025-4166
Last updated: 2026-06-17T09:32:41Z

- Published: 2025-05-02 14:57 UTC · Updated: 2026-06-17 09:32 UTC · Assigner: HashiCorp
- CVSS: 4.5 (CVSS 3.1) · Severity: Medium · Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N
- EPSS: 0.45%, 39th percentile (scored 2026-10-25)
- CISA KEV: no
- CWE: CWE-209

## 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.

## Affected vendors and products

- HashiCorp: Vault
- HashiCorp: Vault Enterprise

## Tracked companies

- [HashiCorp](https://rewindex.com/company/hashicorp.md)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2025-4166)
- [NVD entry](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://discuss.hashicorp.com/t/hcsec-2025-09-vault-may-expose-sensitive-information-in-error-logs-when-processing-malformed-data-with-the-kv-v2-plugin)

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_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


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Canonical: https://rewindex.com/cve/CVE-2025-4166 · Markdown: https://rewindex.com/cve/CVE-2025-4166.md · JSON: https://rewindex.com/api/v1/cves/CVE-2025-4166 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T02:46:26.130Z