CVE-2026-14538

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Source
https://cve.org/CVERecord?id=CVE-2026-14538
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-14538.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2026-14538
Published
2026-07-31T01:42:29Z
Modified
2026-08-12T03:51:45Z
Severity
  • 5.7 (Medium) CVSS_V4 - CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/SC:H/SI:N/SA:N/E:U CVSS Calculator
Summary
BigQuery Dataset Allowlist Bypass via Metadata Dry-Run in MCP Toolbox
Details

An improper authorization and security-boundary bypass vulnerability in the bigquery-execute-sql tool component of Google mcp-toolbox versions 0.16.1 through 1.4.0 allows an authenticated attacker to bypass allowedDatasets validation checks. The toolbox relies on the BigQuery dry-run API to enforce dataset restrictions, but due to a fail-open logic flaw, it bypasses validation when the API returns an empty array for specialized constructs. This allows the attacker to extract structural DDL schemas for explicitly excluded datasets via INFORMATION_SCHEMA, and access downstream federated row data via EXTERNAL_QUERY connections.

Database specific 
{
    "cna_assigner": "Google",
    "cwe_ids": [
        "CWE-285",
        "CWE-863"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/14xxx/CVE-2026-14538.json"
}
References

Affected packages

Git / github.com/googleapis/mcp-toolbox

Affected ranges

Type
GIT
Repo
https://github.com/googleapis/mcp-toolbox
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Last Affected
d67cfbe8ddca5a50c9577ea11feaf5c94d0acace
Database specific
Show details 
{
    "cpe": "cpe:2.3:a:google:mcp_toolbox_for_databases:*:*:*:*:*:*:*:*",
    "extracted_events": [
        {
            "introduced": "0.16.1"
        },
        {
            "last_affected": "1.4.0"
        }
    ],
    "source": [
        "AFFECTED_FIELD",
        "CPE_RANGE"
    ]
}

Affected versions

v0.*
v0.0.1
v0.0.2
v0.0.3
v0.0.4
v0.0.5
v0.1.0
v0.10.0
v0.11.0
v0.12.0
v0.13.0
v0.14.0
v0.15.0
v0.16.0
v0.17.0
v0.18.0
v0.19.1
v0.2.0
v0.2.1
v0.20.0
v0.21.0
v0.22.0
v0.23.0
v0.24.0
v0.25.0
v0.26.0
v0.27.0
v0.28.0
v0.29.0
v0.3.0
v0.30.0
v0.31.0
v0.32.0
v0.4.0
v0.5.0
v0.6.0
v0.7.0
v0.8.0
v0.9.0
v1.*
v1.0.0
v1.1.0
v1.2.0
v1.3.0
v1.4.0

Database specific

source 
"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-14538.json"