CVE-2025-67419: Evershop SVG DoS Vulnerability

CVE-2025-67419 Overview

A Denial of Service (DoS) vulnerability has been identified in EverShop, an open-source e-commerce platform. The vulnerability affects EverShop version 2.1.0 and prior versions, allowing unauthenticated attackers to exhaust the application server's resources through the GET /images API endpoint. The flaw occurs because the application fails to limit the height of use-element shadow trees or the dimensions of pattern tiles during SVG file processing, resulting in unbounded resource consumption and system-wide denial of service.

Critical Impact

Unauthenticated remote attackers can render EverShop e-commerce applications completely unavailable by sending maliciously crafted SVG files, causing resource exhaustion without requiring any credentials or prior authentication.

Affected Products

• EverShop version 2.1.0
• EverShop versions prior to 2.1.0
• All EverShop installations with the default /images API endpoint enabled

Discovery Timeline

• 2026-01-05 - CVE-2025-67419 published to NVD
• 2026-01-08 - Last updated in NVD database

Technical Details for CVE-2025-67419

Vulnerability Analysis

This vulnerability (CWE-1050: Excessive Platform Resource Consumption within a Loop) stems from improper handling of SVG file processing in EverShop's image handling functionality. When a user submits an SVG file through the GET /images API, the server-side processing engine attempts to render the SVG without adequate bounds checking on recursive or nested elements.

The vulnerability specifically manifests when processing SVG files containing deeply nested <use> elements or large pattern tile definitions. These SVG constructs can exponentially expand during rendering, consuming memory and CPU resources far beyond what would be expected for the input file size. This is commonly referred to as a "billion laughs" style attack adapted for SVG rendering.

The attack is particularly severe because it requires no authentication. Any external actor with network access to the EverShop application can trigger the vulnerability, making internet-facing deployments especially vulnerable. A successful attack results in complete denial of service as server resources become exhausted processing the malicious SVG.

Root Cause

The root cause lies in the absence of resource consumption limits during SVG file processing. The application does not implement:

1. Maximum depth limits for recursive SVG element references (such as <use> elements pointing to other definitions)
2. Maximum dimension constraints for pattern tiles that can expand exponentially during rendering
3. Overall resource budgets (memory, CPU time) for individual SVG processing operations

Without these safeguards, an attacker-controlled SVG can specify arbitrarily deep recursion or large pattern expansions that the server faithfully attempts to process, consuming all available resources.

Attack Vector

The attack is executed remotely over the network without requiring authentication. An attacker crafts a malicious SVG file containing either deeply nested use-element shadow trees or pattern tiles with excessive dimensions. This file is then submitted to the vulnerable GET /images API endpoint. The server processes the SVG, triggering exponential resource consumption.

The attack can be amplified by sending multiple concurrent requests, rapidly depleting server resources and causing a complete denial of service for legitimate users attempting to access the e-commerce platform.

For technical details and proof-of-concept information, refer to the GitHub PoC Repository.

Detection Methods for CVE-2025-67419

Indicators of Compromise

• Unusual spikes in CPU and memory utilization on servers hosting EverShop applications
• HTTP requests to the /images API endpoint containing SVG files with abnormally nested <use> elements or <pattern> definitions
• Server unresponsiveness or timeout errors correlating with image processing requests
• Log entries showing memory allocation failures or out-of-memory conditions

Detection Strategies

• Implement web application firewall (WAF) rules to inspect SVG file contents for suspicious nesting patterns or oversized dimension attributes
• Configure application performance monitoring (APM) to alert on sustained high resource utilization during image processing operations
• Deploy network traffic analysis to identify unusual patterns of requests to the /images endpoint, particularly from single sources
• Enable verbose logging for the image processing module to capture details of SVG files triggering extended processing times

Monitoring Recommendations

• Monitor memory consumption trends on EverShop application servers with alerting thresholds set below critical levels
• Track request latency for the /images API endpoint to detect processing delays indicative of exploitation attempts
• Implement rate limiting metrics to identify potential attack sources sending repeated requests
• Review server logs regularly for patterns of failed or timed-out image processing requests

How to Mitigate CVE-2025-67419

Immediate Actions Required

• Implement rate limiting on the /images API endpoint to prevent abuse through repeated malicious requests
• Configure a web application firewall to filter or reject SVG files containing potentially dangerous constructs
• Consider temporarily disabling SVG processing if not critical to business operations until a patch is applied
• Implement resource quotas (memory and CPU time limits) for image processing operations at the infrastructure level

Patch Information

As of the last update on 2026-01-08, check the EverShop GitHub Repository for the latest security patches and version updates that address this vulnerability. Users should upgrade to a patched version as soon as one becomes available.

Workarounds

• Disable SVG file processing entirely by configuring the application to reject SVG MIME types at the /images endpoint
• Implement a reverse proxy or WAF rule to strip or block requests containing SVG content before they reach the application
• Deploy containerization with strict resource limits to prevent a single processing operation from affecting the entire server
• Use a content delivery network (CDN) with built-in DDoS protection as an additional layer of defense

# Example: Nginx rate limiting configuration for the /images endpoint
# Add to your nginx server configuration

limit_req_zone $binary_remote_addr zone=images_limit:10m rate=10r/s;

location /images {
    limit_req zone=images_limit burst=20 nodelay;
    
    # Optional: Block SVG uploads entirely as a temporary workaround
    # if ($content_type ~* "image/svg") {
    #     return 403;
    # }
    
    proxy_pass http://evershop_backend;
}