CVE-2026-26015: DocsGPT RCE Vulnerability

CVE-2026-26015 Overview

DocsGPT is a GPT-powered chat for documentation. A critical command injection vulnerability exists in DocsGPT versions 0.15.0 to before 0.16.0 that allows an attacker to achieve arbitrary remote code execution (RCE). The vulnerability stems from improper neutralization of special elements used in a command (CWE-77), where an attacker can craft a malicious payload that bypasses the "MCP test" behavior to execute arbitrary code on the underlying system.

Critical Impact
This vulnerability enables unauthenticated attackers to execute arbitrary commands on both the official DocsGPT website and any local or public deployment, potentially leading to complete system compromise, data exfiltration, and lateral movement within affected networks.

Affected Products

DocsGPT versions 0.15.0 to before 0.16.0
Official DocsGPT website deployments
Local and public DocsGPT deployments running vulnerable versions

Discovery Timeline

2026-04-29 - CVE-2026-26015 published to NVD
2026-04-29 - Last updated in NVD database

Technical Details for CVE-2026-26015

Vulnerability Analysis

This vulnerability is classified as a command injection flaw (CWE-77) that allows attackers to execute arbitrary code remotely. The attack can be performed over the network without requiring authentication or user interaction, making it trivially exploitable. The impact is severe as successful exploitation grants full control over the affected system, compromising confidentiality, integrity, and availability of both the vulnerable system and potentially connected systems.

The vulnerability affects all DocsGPT deployments running versions 0.15.0 through 0.15.x, including the official DocsGPT website, making this a widespread concern for organizations leveraging this GPT-powered documentation tool.

Root Cause

The root cause lies in the "MCP test" behavior within DocsGPT that fails to properly sanitize or validate user-supplied input before incorporating it into system commands. This improper neutralization of special elements allows attackers to inject malicious command sequences that are then executed with the privileges of the DocsGPT application process.

Attack Vector

The attack is network-based and requires no authentication or user interaction. An attacker can remotely target any vulnerable DocsGPT instance—whether the official website or self-hosted deployments—by crafting a specially designed payload that bypasses the "MCP test" security mechanism. Once the payload is processed, arbitrary commands are executed on the target system.

The vulnerability mechanism involves bypassing input validation in the MCP test functionality. Attackers can inject command separators or other shell metacharacters to break out of the intended command context and execute arbitrary system commands. For technical details on the specific exploitation technique, refer to the GitHub Security Advisory GHSA-gcrq-f296-2j74.

Detection Methods for CVE-2026-26015

Indicators of Compromise

Unexpected child processes spawned by the DocsGPT application process
Unusual outbound network connections from DocsGPT server instances
Suspicious entries in application logs containing shell metacharacters or command sequences
Unauthorized file system modifications or new files in DocsGPT installation directories
Evidence of reverse shell connections or command-and-control communication

Detection Strategies

Monitor DocsGPT application logs for requests containing shell metacharacters such as ;, |, &&, ||, `, $(), or newline characters
Implement network intrusion detection rules to identify potential command injection payloads targeting DocsGPT endpoints
Deploy endpoint detection and response (EDR) solutions to monitor for suspicious process execution chains originating from the DocsGPT application
Conduct regular vulnerability scans to identify DocsGPT instances running affected versions (0.15.0 to 0.15.x)

Monitoring Recommendations

Enable verbose logging for all DocsGPT instances to capture detailed request information
Configure SIEM alerts for anomalous process spawning behavior associated with the DocsGPT application
Implement real-time monitoring of network traffic to and from DocsGPT deployments for signs of data exfiltration or reverse shell activity
Establish baseline behavior metrics for DocsGPT resource utilization to detect command execution anomalies

How to Mitigate CVE-2026-26015

Immediate Actions Required

Upgrade all DocsGPT instances to version 0.16.0 or later immediately
If immediate patching is not possible, take vulnerable DocsGPT deployments offline until they can be updated
Review system logs for evidence of exploitation attempts on vulnerable instances
Conduct forensic analysis on any systems that may have been compromised prior to patching
Reset credentials and API keys for any systems that interacted with vulnerable DocsGPT deployments

Patch Information

The vulnerability has been addressed in DocsGPT version 0.16.0. Organizations should upgrade to this version or later to remediate the vulnerability. The patched release is available at the GitHub Release 0.16.0. For detailed information about the security fix, consult the GitHub Security Advisory GHSA-gcrq-f296-2j74.

Workarounds

Restrict network access to DocsGPT instances using firewall rules to limit exposure to trusted IP ranges only
Deploy a web application firewall (WAF) with command injection detection rules in front of DocsGPT deployments
Implement network segmentation to isolate DocsGPT instances from critical infrastructure
Monitor for and block suspicious request patterns targeting the MCP test functionality

bash

# Example: Restrict DocsGPT access using iptables
# Allow only trusted IP ranges to access DocsGPT service
iptables -A INPUT -p tcp --dport 5000 -s 10.0.0.0/8 -j ACCEPT
iptables -A INPUT -p tcp --dport 5000 -j DROP