CVE-2026-0571: Yeqifu Warehouse Path Traversal Flaw

CVE-2026-0571 Overview

A path traversal vulnerability has been discovered in the yeqifu warehouse project affecting commits up to aaf29962ba407d22d991781de28796ee7b4670e4. This security flaw exists in the createResponseEntity function within the file warehouse\src\main\java\com\yeqifu\sys\common\AppFileUtils.java. The vulnerability allows attackers to manipulate the path argument to traverse directories and access arbitrary files on the system.

Critical Impact

Attackers can exploit this path traversal vulnerability remotely to read sensitive files outside the intended directory, potentially exposing configuration files, credentials, or other confidential data stored on the server.

Affected Products

• yeqifu warehouse (rolling release up to commit aaf29962ba407d22d991781de28796ee7b4670e4)
• Java-based warehouse management application using AppFileUtils.java
• Deployments with network-accessible file retrieval endpoints

Discovery Timeline

• 2026-01-02 - CVE-2026-0571 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2026-0571

Vulnerability Analysis

This vulnerability is classified as CWE-22 (Path Traversal), which occurs when user-supplied input containing directory traversal sequences (such as ../) is not properly sanitized before being used in file system operations. The vulnerable createResponseEntity function in AppFileUtils.java accepts a path parameter that can be manipulated by remote attackers to escape the intended directory structure and access files elsewhere on the file system.

The exploitation requires only low-level privileges and can be performed remotely over the network without any user interaction. This is particularly concerning as the exploit has been publicly released, making it accessible to a wider range of threat actors. The yeqifu warehouse project operates on a rolling release model, meaning there are no specific version numbers to track affected or patched releases.

Root Cause

The root cause of this vulnerability lies in insufficient input validation and sanitization of the path parameter in the createResponseEntity function. The application fails to properly validate or canonicalize the file path before using it to access file system resources. This allows attackers to include path traversal sequences that navigate outside the intended directory boundaries.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An authenticated attacker with low privileges can craft malicious requests containing directory traversal sequences in the path parameter. When processed by the vulnerable createResponseEntity function, these sequences allow navigation to parent directories, enabling access to sensitive files such as /etc/passwd, application configuration files, or database credentials.

The vulnerability enables arbitrary file read operations, where attackers manipulate the path parameter using sequences like ../../../ to traverse directories and access files outside the web application's intended scope. Successful exploitation can lead to disclosure of sensitive system files, configuration data, and potentially credentials stored on the server.

Detection Methods for CVE-2026-0571

Indicators of Compromise

• HTTP requests containing path traversal sequences such as ../, ..%2f, ..%5c, or URL-encoded variants targeting file endpoints
• Unusual access patterns to the AppFileUtils file handling functionality
• Log entries showing attempts to access system files like /etc/passwd, /etc/shadow, or Windows equivalents
• Requests with abnormally long path parameters or repeated parent directory references

Detection Strategies

• Implement web application firewall (WAF) rules to detect and block path traversal patterns in request parameters
• Monitor application logs for file access attempts outside designated directories
• Deploy runtime application self-protection (RASP) solutions to detect path manipulation at the application layer
• Analyze HTTP request logs for suspicious path parameter values containing traversal sequences

Monitoring Recommendations

• Enable verbose logging for the AppFileUtils.java component to capture all file access requests
• Set up alerts for any file access attempts outside the designated upload or storage directories
• Implement file integrity monitoring on sensitive configuration files to detect unauthorized access
• Monitor network traffic for patterns consistent with file exfiltration following successful exploitation

How to Mitigate CVE-2026-0571

Immediate Actions Required

• Restrict network access to the affected warehouse application endpoints to trusted IP addresses only
• Implement input validation to reject any path parameter containing traversal sequences
• Deploy a WAF rule to block requests containing ../ or encoded variants
• Review and audit recent file access logs for signs of exploitation
• Consider temporarily disabling the affected file retrieval functionality until a fix is applied

Patch Information

The yeqifu warehouse project operates on a rolling release basis without version numbering. Organizations using this software should monitor the GitHub repository for updates addressing this vulnerability. Check for commits after aaf29962ba407d22d991781de28796ee7b4670e4 that implement proper path validation in the AppFileUtils.java file. Additional technical details and proof-of-concept information are available through the VulDB entry #339385.

Workarounds

• Implement path canonicalization using Java's getCanonicalPath() method and verify the resolved path remains within the allowed directory
• Add a whitelist of allowed directories and validate that all file access requests resolve to paths within these boundaries
• Use Java's Path.normalize() combined with startsWith() checks to ensure paths cannot escape the designated base directory
• Deploy reverse proxy rules to sanitize path parameters before they reach the application

# Configuration example - Apache mod_security rule to block path traversal
# Add to Apache configuration or .htaccess file
SecRule REQUEST_URI|ARGS|ARGS_NAMES "@rx \.\./" \
    "id:1001,phase:1,deny,status:403,msg:'Path Traversal Attempt Blocked'"

# Nginx configuration to reject path traversal attempts
# Add to server or location block
if ($request_uri ~* "\.\.") {
    return 403;
}