Path Traversal via Symlink Following in allowedLocalRoots in MCP Toolbox for Databases (CVE-2026-102242) | HOL Guard CVE

High · CVSS 8.6CVE-2026-102242

Path Traversal via Symlink Following in allowedLocalRoots in MCP Toolbox for Databases

Answer in brief

CVE-2026-102242 records a High severity (CVSS 8.6) vulnerability in Path Traversal via Symlink Following in allowedLocalRoots in MCP Toolbox for Databases. The current sources do not mark it as known exploited. The current feed maps Google/MCP Toolbox for Databases (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 29, 2026Updated Sep 29, 2026Source checked Sep 29, 2026First seen by HOL Sep 29, 2026Material review Sep 29, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.6
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Not reported

Why this deserves its current priority

CVSS is 8.6. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Google/MCP Toolbox for Databases (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Google/MCP Toolbox for Databasesgeneric	>=1.2.0 <=1.9.0	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Google/MCP Toolbox for Databases.
Review the reported fix. Monitor this advisory for an available fix and review any installs of the affected package.

Evidence timeline and material changes

Published upstream
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 29, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 29, 2026

Sources and claim methodology

GitHub security advisorygithub.com

Upstream source description

Improper link resolution (CWE-59 / CWE-22) in the allowedLocalRoots path validation in Google MCP Toolbox for Databases versions 1.2.0 through 1.9.0 allows a remote authenticated attacker with tool execution permissions to bypass directory boundary restrictions via symbolic links. Because path validation checks directories lexically without resolving symbolic links first, an attacker can access or overwrite arbitrary local files located outside the permitted root directories.

Quoted source text, attributed separately from HOL analysis.