CVE-2026-22777: ComfyUI-Manager Injection Vulnerability

CVE-2026-22777 Overview

CVE-2026-22777 is a configuration injection vulnerability in ComfyUI-Manager, an extension designed to enhance the usability of ComfyUI. Prior to versions 3.39.2 and 4.0.5, an attacker can inject special characters into HTTP query parameters to add arbitrary configuration values to the config.ini file. This vulnerability allows unauthorized modification of security settings and application behavior through CRLF injection techniques.

Critical Impact

Attackers can tamper with security settings and modify application behavior by injecting arbitrary configuration values, potentially disabling security controls or altering critical application parameters.

Affected Products

• ComfyUI-Manager versions prior to 3.39.2
• ComfyUI-Manager versions prior to 4.0.5

Discovery Timeline

• 2026-01-10 - CVE CVE-2026-22777 published to NVD
• 2026-01-13 - Last updated in NVD database

Technical Details for CVE-2026-22777

Vulnerability Analysis

This vulnerability is classified under CWE-93 (Improper Neutralization of CRLF Sequences) and represents a configuration injection weakness in ComfyUI-Manager. The application fails to properly sanitize user-controlled input in HTTP query parameters before writing configuration values to the config.ini file. By injecting special characters such as newlines and carriage returns, an attacker can insert arbitrary key-value pairs into the configuration file.

The network-accessible nature of this vulnerability means attackers can exploit it remotely without authentication. The impact primarily affects the integrity of the application, allowing unauthorized modification of configuration settings while not directly compromising confidentiality or availability.

Root Cause

The root cause is improper input validation in the HTTP request handling code. The application accepts user-supplied values from query parameters and writes them directly to the configuration file without sanitizing special characters. This allows CRLF injection attacks where attackers can terminate the intended configuration line and inject additional configuration directives.

Attack Vector

The attack is conducted over the network by sending crafted HTTP requests containing malicious query parameters. An attacker can embed newline characters (\n), carriage returns (\r), path traversal sequences (..), or null bytes (\\x00) to manipulate how configuration values are written. This can lead to:

• Modification of security settings to weaken application defenses
• Injection of malicious configuration values to alter application behavior
• Potential path traversal to write to unintended file locations

The security patch introduces the get_safe_snapshot_path() function that validates input by checking for path traversal characters and null bytes:

def get_safe_snapshot_path(target):
    """
    Safely construct a snapshot file path, preventing path traversal attacks.
    """
    if '/' in target or '\\' in target or '..' in target or '\\x00' in target:
        return None
    return os.path.join(core.manager_snapshot_path, f"{target}.json")

Source: GitHub Commit Reference

Detection Methods for CVE-2026-22777

Indicators of Compromise

• Unexpected modifications to config.ini files containing injected configuration values
• HTTP access logs showing requests with URL-encoded newline characters (%0a, %0d) or path traversal sequences in query parameters
• Configuration file entries that deviate from expected formats or contain suspicious key-value pairs
• Application behavior changes that cannot be attributed to legitimate administrative actions

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block HTTP requests containing CRLF sequences (%0d%0a, \r\n) in query parameters
• Monitor file integrity of config.ini and related configuration files for unauthorized changes
• Analyze HTTP server logs for anomalous query parameter patterns indicative of injection attempts
• Deploy runtime application self-protection (RASP) solutions to detect configuration file manipulation

Monitoring Recommendations

• Enable detailed HTTP request logging including full query strings for forensic analysis
• Configure file integrity monitoring (FIM) on ComfyUI-Manager configuration directories
• Set up alerts for configuration file modifications outside of expected maintenance windows
• Monitor application logs for errors related to malformed configuration parsing

How to Mitigate CVE-2026-22777

Immediate Actions Required

• Upgrade ComfyUI-Manager to version 3.39.2 or 4.0.5 immediately
• Review config.ini files for any unauthorized or suspicious configuration entries
• Audit HTTP access logs for signs of exploitation attempts
• Restrict network access to ComfyUI-Manager to trusted IP addresses where possible

Patch Information

The vulnerability has been addressed in ComfyUI-Manager versions 3.39.2 and 4.0.5. The patch introduces input sanitization and path traversal protection through the get_safe_snapshot_path() function. Organizations should update to these patched versions immediately. Technical details and the patch can be reviewed in the GitHub Security Advisory GHSA-562r-8445-54r2 and the associated commit.

Workarounds

• Place ComfyUI-Manager behind a reverse proxy that sanitizes CRLF sequences from incoming requests
• Implement network segmentation to limit exposure of the ComfyUI-Manager interface to untrusted networks
• Configure file system permissions to restrict write access to configuration files
• Disable or restrict access to vulnerable endpoints until the patch can be applied

# Example: Restrict network access using iptables
iptables -A INPUT -p tcp --dport 8188 -s 192.168.1.0/24 -j ACCEPT
iptables -A INPUT -p tcp --dport 8188 -j DROP