CVE-2026-6057: FalkorDB Browser RCE Vulnerability

CVE-2026-6057 Overview

CVE-2026-6057 is a critical path traversal vulnerability affecting FalkorDB Browser version 1.9.3. The vulnerability exists in the file upload API, which lacks proper authentication and input validation. Remote attackers can exploit this flaw to traverse directory paths and write arbitrary files to the system, ultimately achieving remote code execution.

Critical Impact

Unauthenticated remote attackers can achieve full remote code execution by exploiting the path traversal flaw in the file upload API, potentially compromising the entire server and any data managed by FalkorDB Browser.

Affected Products

• FalkorDB Browser 1.9.3

Discovery Timeline

• 2026-04-10 - CVE-2026-6057 published to NVD
• 2026-04-13 - Last updated in NVD database

Technical Details for CVE-2026-6057

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Improper Limitation of a Pathname to a Restricted Directory), commonly known as path traversal or directory traversal. The flaw resides in the file upload API endpoint of FalkorDB Browser, which fails to implement proper authentication controls and does not adequately sanitize user-supplied file paths.

When processing file upload requests, the application accepts filename parameters that include directory traversal sequences (such as ../) without proper validation. This allows an attacker to escape the intended upload directory and write files to arbitrary locations on the file system. Combined with the lack of authentication, any remote attacker with network access to the FalkorDB Browser instance can exploit this vulnerability without needing valid credentials.

The impact of successful exploitation is severe. An attacker can write malicious files to sensitive system locations, overwrite configuration files, or place executable payloads (such as web shells or scheduled task scripts) in locations where they will be executed by the system. This chain of actions results in complete remote code execution under the context of the FalkorDB Browser process.

Root Cause

The root cause stems from insufficient input validation in the file upload API. The application fails to properly sanitize user-controlled filename parameters, allowing directory traversal sequences to be processed. Additionally, the API endpoint lacks authentication enforcement, exposing this dangerous functionality to unauthenticated remote users.

Attack Vector

This vulnerability is exploitable over the network without requiring authentication or user interaction. An attacker can craft HTTP requests to the file upload API endpoint with malicious filenames containing path traversal sequences. The server processes these requests and writes the uploaded content to attacker-controlled paths outside the intended upload directory.

A typical exploitation scenario involves uploading a malicious script (such as a web shell) to a web-accessible directory or writing a cron job/scheduled task that executes attacker-controlled code. The attack can be automated and requires no special conditions, making it highly reliable in vulnerable environments.

Detection Methods for CVE-2026-6057

Indicators of Compromise

• Unexpected files appearing in system directories outside the normal FalkorDB Browser upload paths
• Web shells or suspicious scripts in web-accessible directories (e.g., .php, .jsp, .py files)
• Log entries showing file upload requests with ../ sequences in filenames or paths
• Unexpected process execution originating from the FalkorDB Browser service account

Detection Strategies

• Monitor HTTP request logs for file upload API calls containing path traversal patterns (../, ..\\, URL-encoded variants like %2e%2e%2f)
• Implement file integrity monitoring on critical system directories to detect unauthorized file creation or modification
• Deploy web application firewall (WAF) rules to detect and block path traversal attempts in upload requests
• Review FalkorDB Browser access logs for unauthenticated requests to sensitive API endpoints

Monitoring Recommendations

• Enable detailed access logging for the FalkorDB Browser application and review regularly
• Configure security information and event management (SIEM) alerts for path traversal patterns
• Monitor for new processes spawned by the FalkorDB Browser service that deviate from normal behavior
• Implement network segmentation to limit exposure of FalkorDB Browser instances

How to Mitigate CVE-2026-6057

Immediate Actions Required

• Restrict network access to FalkorDB Browser instances to trusted networks only using firewall rules
• Disable or restrict access to the file upload API endpoint if it is not required for operations
• Implement authentication on all API endpoints as an interim measure
• Audit existing systems for signs of compromise before applying patches

Patch Information

A fix for this vulnerability is available via GitHub Pull Request #1611. Organizations should review the pull request and apply the updated version of FalkorDB Browser as soon as it becomes available in an official release. The patch addresses the path traversal issue by implementing proper input sanitization and access controls on the file upload API.

For the latest version and release information, visit the FalkorDB Browser GitHub Repository.

Workarounds

• Place FalkorDB Browser behind a reverse proxy that enforces authentication for all requests
• Configure network firewall rules to allow access only from specific trusted IP addresses
• Run FalkorDB Browser in a containerized environment with restricted filesystem access and read-only root filesystem where possible
• Disable the file upload functionality entirely if it is not a business requirement

# Example: Restrict network access using iptables
# Allow only trusted IP range to access FalkorDB Browser port
iptables -A INPUT -p tcp --dport 3000 -s 10.0.0.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 3000 -j DROP