CVE-2026-101068: dbgate Path Traversal Vulnerability

CVE-2026-101068 Overview

CVE-2026-101068 is a path traversal vulnerability [CWE-22] in dbgate through version 7.3.1. The flaw resides in the zipJsonLinesData function within packages/api/src/utility/zipJsonLinesData.js, part of the Create Connection Endpoint component. An attacker can manipulate the filePath argument to write files outside the intended directory. Remote exploitation requires no authentication or user interaction. A prior hardening effort (PR #1530 / commit 5f99b4d82 in version 7.2.5) added checkSecureExportFilePath to other export endpoints but omitted this one. Public exploit details have been released, and the vendor did not respond to disclosure attempts.

Critical Impact

Unauthenticated remote attackers can write arbitrary files outside the intended export directory, enabling configuration tampering and potential follow-on compromise of the dbgate host.

Affected Products

• dbgate versions up to and including 7.3.1
• Component: Create Connection Endpoint (packages/api/src/utility/zipJsonLinesData.js)
• Deployments exposing the dbgate API over the network

Discovery Timeline

• 2026-09-28 - CVE-2026-101068 published to the National Vulnerability Database (NVD)
• 2026-09-28 - Last updated in NVD database

Technical Details for CVE-2026-101068

Vulnerability Analysis

The vulnerability affects the zipJsonLinesData function used by the Create Connection Endpoint in dbgate. The function accepts a filePath parameter and writes data to that location without validating the resolved path. An attacker supplies traversal sequences such as ../ to escape the expected export directory. The result is arbitrary file write under the privileges of the dbgate process. Because the endpoint requires no authentication and is reachable over the network, exploitation can occur directly against exposed instances. Public analysis is available in the GitHub CVE Analysis.

Root Cause

The root cause is missing path canonicalization and sanitization on the filePath argument before file operations. A previous security patch, PR #1530 (commit 5f99b4d82) in release 7.2.5, introduced a checkSecureExportFilePath helper to validate paths across export endpoints. That helper was not applied to the zipJsonLinesData code path, leaving the Create Connection Endpoint vulnerable to traversal.

Attack Vector

An unauthenticated remote attacker sends a crafted request to the Create Connection Endpoint with a filePath value containing directory traversal sequences. The dbgate server writes the attacker-controlled archive content to the resolved location on disk. Depending on process permissions, the attacker can overwrite configuration files, drop payloads into web-accessible directories, or clobber application assets.

For technical details, see the VulDB Vulnerability Overview and the published GitHub CVE Analysis.

Detection Methods for CVE-2026-101068

Indicators of Compromise

• Requests to the dbgate Create Connection Endpoint containing ../, ..\, or URL-encoded traversal sequences in the filePath parameter
• Unexpected .zip or JSON-lines files written outside the designated dbgate export directory
• Modifications to dbgate configuration files or application assets with timestamps that correlate to API activity

Detection Strategies

• Inspect HTTP request bodies to the Create Connection Endpoint for filePath values that resolve outside the intended export root
• Monitor the dbgate process for file write operations targeting system or web-root directories
• Correlate anomalous API calls with subsequent file creation events on the host filesystem

Monitoring Recommendations

• Enable verbose request logging on the dbgate API and ship logs to a centralized analytics platform for traversal-pattern analysis
• Alert on new or modified files in sensitive directories owned by the dbgate service account
• Track outbound connections from the dbgate host that follow suspicious write activity, which may indicate post-exploitation staging

How to Mitigate CVE-2026-101068

Immediate Actions Required

• Restrict network access to the dbgate API so it is reachable only from trusted administrative networks
• Run the dbgate service under a least-privileged account that cannot overwrite system or web-root files
• Audit the host for unexpected files written by the dbgate process since the service was deployed

Patch Information

No vendor patch is available at the time of publication. The upstream project did not respond to disclosure. Operators should track the dbgate repository for an updated release that extends checkSecureExportFilePath to the zipJsonLinesData code path, consistent with the hardening introduced in PR #1530 / commit 5f99b4d82.

Workarounds

• Place the dbgate API behind an authenticating reverse proxy that rejects requests containing traversal sequences in parameters
• Apply a web application firewall rule to block ../, ..\, and encoded variants in request bodies targeting the Create Connection Endpoint
• Run dbgate inside a container or chroot with a read-only filesystem outside the designated export directory

# Example nginx snippet to block traversal patterns in requests to dbgate
location /api/ {
    if ($request_body ~* "(\.\./|\.\.\\|%2e%2e%2f|%2e%2e/)") {
        return 403;
    }
    proxy_pass http://dbgate_backend;
}