CVE-2026-35052: D-Tale RCE Vulnerability

CVE-2026-35052 Overview

D-Tale is a powerful data visualization tool combining a Flask back-end with a React front-end for viewing and analyzing Pandas data structures. A critical vulnerability exists in versions prior to 3.22.0 that affects users hosting D-Tale publicly while using redis or shelf storage layers. This vulnerability enables remote code execution, allowing attackers to run malicious code on the server.

Critical Impact

Attackers can achieve remote code execution on D-Tale servers configured with redis or shelf storage layers when exposed to public networks, potentially leading to complete system compromise.

Affected Products

• D-Tale versions prior to 3.22.0
• D-Tale deployments using redis storage layer
• D-Tale deployments using shelf storage layer

Discovery Timeline

• 2026-04-06 - CVE CVE-2026-35052 published to NVD
• 2026-04-07 - Last updated in NVD database

Technical Details for CVE-2026-35052

Vulnerability Analysis

This vulnerability is classified under CWE-79, indicating cross-site scripting characteristics, though the primary impact described is remote code execution. The vulnerability affects D-Tale installations that are publicly accessible and utilize either redis or shelf storage backends for data persistence. The combination of public exposure and these specific storage configurations creates an attack surface that allows remote attackers to inject and execute malicious code on the target server.

The attack requires network access and some user interaction, but no authentication is necessary to exploit the vulnerability. While the direct impact on the vulnerable system's confidentiality, integrity, and availability is limited, the vulnerability enables attackers to affect subsequent systems through the compromised D-Tale instance.

Root Cause

The root cause lies in improper handling of user-supplied input when D-Tale processes data through redis or shelf storage layers. When these storage backends are configured, the application fails to properly sanitize or validate data before processing, creating an injection point that attackers can exploit to execute arbitrary code on the server.

Attack Vector

The attack vector is network-based, targeting publicly accessible D-Tale instances. An attacker can exploit this vulnerability by sending specially crafted requests to the D-Tale server that leverage the redis or shelf storage processing pipeline. The malicious payload bypasses input validation and gets executed in the server context.

The vulnerability mechanism involves the storage layer processing untrusted input without adequate sanitization. When D-Tale retrieves or processes data from redis or shelf storage, attackers can inject code that gets executed on the server. For technical details on the exploitation mechanism, refer to the GitHub Security Advisory.

Detection Methods for CVE-2026-35052

Indicators of Compromise

• Unexpected network connections from D-Tale server processes to external hosts
• Anomalous process execution spawned by Flask/Python worker processes
• Unusual redis or shelf storage access patterns outside normal application behavior
• Modified or newly created files in D-Tale server directories

Detection Strategies

• Monitor web application logs for suspicious request patterns targeting D-Tale endpoints
• Implement network intrusion detection rules for anomalous traffic to D-Tale instances
• Deploy file integrity monitoring on D-Tale server directories
• Audit redis storage access logs for unauthorized or malformed commands

Monitoring Recommendations

• Configure alerts for D-Tale processes spawning child processes or executing system commands
• Implement rate limiting and request analysis on publicly exposed D-Tale endpoints
• Monitor system resource utilization for signs of unauthorized code execution
• Review Flask application logs for error patterns that may indicate exploitation attempts

How to Mitigate CVE-2026-35052

Immediate Actions Required

• Upgrade D-Tale to version 3.22.0 or later immediately
• Restrict public access to D-Tale instances until patching is complete
• Implement network-level access controls to limit exposure of D-Tale services
• Review server logs for signs of prior exploitation attempts

Patch Information

The vulnerability has been addressed in D-Tale version 3.22.0. Organizations should update to this version or later to remediate the vulnerability. The fix is available through standard package management channels. For detailed information about the security fix, refer to the GitHub Security Advisory.

Workarounds

• Avoid exposing D-Tale instances directly to public networks; use VPN or internal network access only
• Consider switching from redis or shelf storage layers to alternative storage configurations until patching
• Implement a reverse proxy with Web Application Firewall (WAF) rules in front of D-Tale
• Enable authentication mechanisms to restrict access to authorized users only

# Configuration example - Restrict D-Tale to localhost only
# Start D-Tale bound to localhost instead of all interfaces
dtale --host 127.0.0.1 --port 40000

# Use nginx as a reverse proxy with access controls
# /etc/nginx/conf.d/dtale.conf
# server {
#     listen 443 ssl;
#     server_name dtale.internal.example.com;
#     
#     # Restrict access to internal network
#     allow 10.0.0.0/8;
#     allow 192.168.0.0/16;
#     deny all;
#     
#     location / {
#         proxy_pass http://127.0.0.1:40000;
#     }
# }