CVE-2026-45230: DumbAssets Path Traversal Vulnerability

CVE-2026-45230 Overview

CVE-2026-45230 is a path traversal vulnerability [CWE-22] affecting DumbAssets through version 1.0.11. The flaw resides in the POST /api/delete-file endpoint, which processes the filesToDelete array parameter without proper directory boundary validation. Unauthenticated attackers can supply ../ sequences to traverse outside the intended application directory and delete arbitrary files on the host. Authentication on this endpoint is optional and disabled by default, leaving most deployments exposed. Deleting critical files such as server.js or package.json results in a complete denial of service for the application.

Critical Impact
Unauthenticated remote attackers can delete arbitrary files on the server, causing complete denial of service by removing application runtime files.

Affected Products

DumbAssets versions up to and including 1.0.11
DumbWareio DumbAssets deployments with default configuration
Instances where the optional authentication control remains disabled

Discovery Timeline

2026-05-18 - CVE-2026-45230 published to NVD
2026-05-18 - Last updated in NVD database

Technical Details for CVE-2026-45230

Vulnerability Analysis

DumbAssets exposes a POST /api/delete-file endpoint that accepts a filesToDelete array. The endpoint constructs filesystem paths from user-supplied values without canonicalizing them or validating that the resolved path remains within the application's intended working directory. An attacker submitting entries containing ../ traversal sequences can escape the asset directory and reference arbitrary paths on the host filesystem. The application then performs deletion against those resolved paths, granting attackers unauthenticated file deletion across any location accessible to the DumbAssets process user.

Root Cause

The vulnerability stems from missing directory boundary validation [CWE-22] on the filesToDelete parameter. The application does not normalize paths or compare the resolved absolute path against a permitted base directory before invoking deletion. Compounding this, the endpoint's authentication control is optional and disabled in the default configuration, removing any access barrier to the dangerous operation.

Attack Vector

The attack is network-reachable and requires no authentication or user interaction. An attacker sends a crafted HTTP POST request to /api/delete-file containing a filesToDelete array with traversal sequences such as ../../server.js or ../../package.json. Successful exploitation removes files required by the Node.js runtime, terminating service availability. The vulnerability mechanism is documented in the VulnCheck Security Advisory and the upstream GitHub Pull Request Discussion.

Detection Methods for CVE-2026-45230

Indicators of Compromise

HTTP POST requests to /api/delete-file containing ../ or URL-encoded %2e%2e%2f sequences in the filesToDelete array
Unexpected deletion of application runtime files such as server.js, package.json, or configuration files
DumbAssets process crashes or restart loops following 200-series responses from /api/delete-file

Detection Strategies

Inspect web server and reverse proxy logs for POST requests to /api/delete-file with traversal patterns in the request body
Deploy filesystem integrity monitoring on the DumbAssets installation directory and parent directories to flag unauthorized deletions
Alert on anomalous outbound 4xx/5xx responses correlated with file deletion API activity

Monitoring Recommendations

Enable verbose access logging on any reverse proxy fronting DumbAssets and forward logs to a centralized SIEM for traversal pattern matching
Monitor for unauthenticated requests to administrative or file management endpoints from external IP ranges
Configure alerts on process termination events for the DumbAssets service and correlate them with recent API activity

How to Mitigate CVE-2026-45230

Immediate Actions Required

Upgrade DumbAssets to a version newer than 1.0.11 once a fixed release is published by the maintainers
Enable the optional authentication control on the DumbAssets instance immediately, since it is disabled by default
Restrict network access to the DumbAssets management interface using firewall rules or reverse proxy allow-lists

Patch Information

Refer to the upstream GitHub Pull Request Discussion for remediation status and the VulnCheck Security Advisory for fix tracking. Apply the maintainer-provided patch as soon as it becomes available.

Workarounds

Place DumbAssets behind a reverse proxy that blocks requests to /api/delete-file containing ../, ..\, or encoded traversal variants
Run the DumbAssets process under a low-privilege user account with filesystem access restricted to the asset directory only
Deploy the application within a container with a read-only root filesystem and a dedicated writable volume for assets

bash

# Example nginx rule to block traversal sequences targeting the vulnerable endpoint
location = /api/delete-file {
    if ($request_body ~* "\.\./|\.\.%2f|%2e%2e/") {
        return 403;
    }
    proxy_pass http://dumbassets_upstream;
}