Medium
Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2025-4166
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 7 Nov 2026, 01:57 UTC · Revision 1
Source evidence
Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin
core-osv · Original sourcePublished 2 May 2025, 14:57 UTC
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.
osv:CVE-2025-4166
Complete source record
{
"id": "cd37a3ac28d0970251f883349634795164d6bb450ae47a2608cb2063561ec054",
"url": "https://osv.dev/vulnerability/CVE-2025-4166",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Vault May Include Sensitive Data in Error Logs When Using the KV v2 Plugin",
"summary": "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.",
"evidence": "osv:CVE-2025-4166",
"products": [],
"severity": "medium",
"structured": {
"id": "CVE-2025-4166",
"aliases": [
"BIT-openbao-2025-4166",
"BIT-vault-2025-4166",
"CVE-2025-4166",
"GHSA-gcqf-f89c-68hv",
"GO-2025-3663"
],
"metrics": [
{
"type": "CVSS_V3",
"score": "CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:H/I:N/A:N"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/hashicorp/vault",
"type": "GIT",
"events": [
{
"introduced": "347f48c55bae0fa7a36d8eae6028de9a6eeefc01"
},
{
"fixed": "a2de3bb7bcf4a073cbb8724863a5a88d3c2f83da"
},
{
"introduced": "7eeafb6160d60ede73c1d95566b0c8ea54f3cb5a"
},
{
"fixed": "a2de3bb7bcf4a073cbb8724863a5a88d3c2f83da"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:hashicorp:vault:*:*:*:*:-:*:*:*",
"range": [
{
"introduced": "0.3.0"
},
{
"fixed": "1.19.3"
}
],
"source": "CPE_RANGE"
},
{
"cpe": "cpe:2.3:a:hashicorp:vault:*:*:*:*:enterprise:*:*:*",
"range": [
{
"introduced": "1.19.0"
},
{
"fixed": "1.19.3"
}
],
"source": "CPE_RANGE"
}
]
}
},
{
"repo": "https://github.com/openbao/openbao",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"fixed": "8c0322c0423231836a1432fdad29dc2e99640da9"
}
],
"database_specific": {
"extracted_events": [
{
"cpe": "cpe:2.3:a:openbao:openbao:*:*:*:*:*:*:*:*",
"range": [
{
"introduced": "0"
},
{
"fixed": "2.2.2"
}
],
"source": "CPE_RANGE"
}
]
}
}
],
"versions": [
"v1.19.2",
"v1.19.1",
"v1.19.0",
"v2.2.1",
"v2.2.0",
"v2.2.0-beta20250213",
"sdk/v2.2.0",
"api/v2.2.0",
"api/auth/userpass/v2.2.0",
"api/auth/ldap/v2.2.0",
"api/auth/kubernetes/v2.2.0",
"api/auth/approle/v2.2.0",
"v2.1.0-beta20241114.3",
"v2.1.0-beta20241114.2",
"v2.1.0-beta20241114.1",
"v2.1.0-beta20241114",
"sdk/v2.1.0",
"api/v2.1.0",
"v2.0.0",
"sdk/v2.0.1",
"api/v2.0.1",
"api/auth/userpass/v2.0.1",
"api/auth/ldap/v2.0.1",
"api/auth/kubernetes/v2.0.1",
"api/auth/approle/v2.0.1",
"v2.0.0-beta20240618",
"sdk/v1.100.0-development20240408",
"api/v1.100.0-development20240408",
"api/auth/userpass/v1.1.0-development20240408",
"api/auth/ldap/v1.1.0-development20240408",
"api/auth/kubernetes/v1.1.0-development20240408",
"api/auth/gcp/v1.1.0-development20240408",
"api/auth/azure/v1.1.0-development20240408",
"api/auth/aws/v1.1.0-development20240408",
"api/auth/approle/v1.1.0-development20240408",
"v2.0.0-alpha20240329",
"before-plugin-removal",
"api/auth/userpass/v0.4.1",
"api/auth/gcp/v0.4.1",
"api/auth/azure/v0.4.1",
"api/auth/aws/v0.4.1",
"api/auth/approle/v0.4.1",
"sdk/v0.9.1",
"api/v1.9.2",
"api/v1.9.1",
"sdk/v0.9.0",
"api/auth/userpass/v0.4.0",
"api/auth/gcp/v0.4.0",
"api/auth/azure/v0.4.0",
"api/auth/aws/v0.4.0",
"api/auth/approle/v0.4.0",
"sdk/v0.8.0",
"api/v1.9.0",
"api/v1.8.3",
"sdk/v0.7.0",
"sdk/v0.6.2",
"sdk/v0.6.1",
"api/v1.8.2",
"api/v1.8.1",
"api/auth/userpass/v0.3.0",
"api/auth/gcp/v0.3.0",
"api/auth/azure/v0.3.0",
"api/auth/aws/v0.3.0",
"api/auth/approle/v0.3.0",
"api/v1.8.0",
"sdk/v0.6.0",
"api/auth/userpass/v0.2.0",
"api/auth/gcp/v0.2.0",
"api/auth/azure/v0.2.0",
"api/auth/aws/v0.2.0",
"api/auth/approle/v0.2.0",
"sdk/v0.5.3",
"api/v1.7.2",
"sdk/v0.5.1",
"api/v1.7.1",
"api/v1.7.0",
"api/v1.6.0",
"sdk/v0.5.0",
"api/v1.5.0",
"sdk/v0.4.1",
"api/v1.3.1",
"api/auth/approle/v0.1.1",
"api/auth/gcp/v0.1.0",
"api/auth/azure/v0.1.0",
"api/auth/userpass/v0.1.0",
"api/auth/aws/v0.1.0",
"api/auth/approle/v0.1.0",
"sdk/v0.3.0",
"api/v1.2.0",
"api/v1.1.1",
"sdk/v0.2.1",
"api/v1.0.4",
"sdk/v0.1.13",
"api/v1.0.3",
"sdk/v0.1.12",
"sdk/v0.1.11",
"sdk/v0.1.10",
"api/v1.0.2",
"sdk/v0.1.9",
"api/v1.0.1",
"sdk/v0.1.8"
],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-4166.json"
}
}
],
"modified": "2026-10-28T02:30:48.792462182Z",
"provider": "osv",
"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",
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/4xxx/CVE-2025-4166.json",
"https://nvd.nist.gov/vuln/detail/CVE-2025-4166",
"https://github.com/hashicorp/vault"
],
"provider_metadata": {
"cwe_ids": [
"CWE-209"
],
"cna_assigner": "HashiCorp",
"unresolved_ranges": [
{
"extracted_events": [
{
"range": [
{
"introduced": "0.10.0"
},
{
"fixed": "1.18.9"
}
],
"source": "AFFECTED_FIELD",
"strategy": "ChangesAt"
}
]
}
],
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/4xxx/CVE-2025-4166.json"
}
},
"related_cves": [
{
"value": "CVE-2025-4166",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 517161,
"published_at": "2025-05-02T14:57:58.71+00:00"
}