CVE-2026-48017: DbGate RCE Vulnerability

CVE-2026-48017 Overview

CVE-2026-48017 is a code injection vulnerability in DbGate, a cross-platform database manager. The flaw affects versions 7.1.8 and prior. The POST /runners/load-reader endpoint interpolates the functionName parameter directly into a JavaScript code template without sanitization or validation. An authenticated user with basic access can inject arbitrary JavaScript that executes on the server with full Node.js process privileges. The injection bypasses the require=null sandbox restriction designed to limit script capabilities. The vulnerability is tracked under CWE-94: Improper Control of Generation of Code.

Critical Impact
Authenticated attackers can execute arbitrary OS commands, read connection credentials, pivot to connected databases, and obtain root access inside Docker container deployments.

Affected Products

DbGate versions 7.1.8 and prior
DbGate Docker deployments running affected versions
Self-hosted DbGate instances exposed to authenticated users

Discovery Timeline

2026-06-15 - CVE-2026-48017 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-48017

Vulnerability Analysis

The vulnerability resides in the /runners/load-reader endpoint of the DbGate server. The endpoint constructs a JavaScript code template at runtime and embeds the user-supplied functionName value through string interpolation. Because no validation, escaping, or allowlist is applied, an attacker can terminate the expected identifier and append arbitrary JavaScript statements. The resulting code is then evaluated by the Node.js runtime.

DbGate attempts to constrain script execution by nulling require to prevent module loading. This sandbox is incomplete. Attackers can reach Node.js internals through existing object references and obtain a reference to child_process, restoring full execution capability. See the GitHub Security Advisory GHSA-hv83-ggc4-v385 for additional context.

Root Cause

The root cause is unsanitized server-side template assembly. The functionName parameter is treated as trusted code rather than untrusted input. No type checking, character allowlist, or syntactic validation is performed before the parameter is concatenated into executable JavaScript. The sandbox layer that nulls require does not block prototype walks or access to globals already in scope.

Attack Vector

Exploitation requires only basic authenticated access. No administrative role and no run-shell-script permission are required. An attacker sends a crafted POST request to /runners/load-reader containing a malicious functionName value. The injected payload executes inside the DbGate server process. From there, the attacker can run operating system commands, read or write any file accessible to the process, exfiltrate stored database connection credentials, and pivot into the connected database backends. In containerized deployments, the process typically runs as root within the container.

Detection Methods for CVE-2026-48017

Indicators of Compromise

Unexpected POST requests to /runners/load-reader with functionName values containing characters such as (, ), ;, backticks, or whitespace.
DbGate process spawning child processes such as sh, bash, cmd.exe, powershell.exe, or node subprocesses with inline scripts.
Outbound network connections initiated by the DbGate Node.js process to unfamiliar hosts.
Reads of DbGate configuration or credential storage files outside normal application startup.

Detection Strategies

Inspect HTTP logs for requests to /runners/load-reader and validate that functionName matches a strict identifier pattern such as ^[A-Za-z_][A-Za-z0-9_]*$.
Correlate web request logs with process creation telemetry to detect command execution following calls to the vulnerable endpoint.
Monitor for unauthorized access to database connection configuration files on the DbGate host.

Monitoring Recommendations

Enable verbose access logging on the DbGate reverse proxy and forward logs to a centralized analytics platform.
Alert on any child process spawned by the DbGate Node.js process in production environments.
Track authentication events for DbGate accounts and review session activity from unfamiliar source IP addresses.

How to Mitigate CVE-2026-48017

Immediate Actions Required

Upgrade DbGate to version 7.1.9 or later as published in the DbGate v7.1.9 release.
Restrict network exposure of DbGate instances to trusted administrative networks or VPN segments.
Rotate database connection credentials stored within DbGate if a compromise is suspected.
Audit DbGate user accounts and remove unused or low-trust accounts that retain basic access.

Patch Information

The DbGate maintainers addressed CVE-2026-48017 in version 7.1.9. The fix sanitizes and validates the functionName parameter so it can no longer be used to inject arbitrary JavaScript into the /runners/load-reader code template. Patch details are available in the GitHub Security Advisory GHSA-hv83-ggc4-v385 and the v7.1.9 release notes.

Workarounds

Place DbGate behind an authenticating reverse proxy and block requests to /runners/load-reader from untrusted sources until patching is complete.
Run the DbGate container as a non-root user and apply read-only filesystem flags to limit post-exploitation impact.
Disable or remove user accounts that do not require interactive access to DbGate.

bash

# Configuration example: pull and run the patched DbGate image
docker pull dbgate/dbgate:7.1.9
docker run -d \
  --name dbgate \
  --user 1000:1000 \
  --read-only \
  -p 127.0.0.1:3000:3000 \
  dbgate/dbgate:7.1.9