Can you explain this vulnerability to me?

CVE-2026-2531 is a Server-Side Request Forgery (SSRF) vulnerability found in MindsDB versions up to 25.14.1, specifically in the file upload functionality within the function clear_filename in mindsdb/utilities/security.py.

The vulnerability arises because the URL validation logic improperly uses the netloc component of URLs, which includes userinfo (like username@host), instead of the hostname component. This allows an attacker to craft URLs containing userinfo to bypass blacklist restrictions.

By exploiting this flaw, an attacker can cause the MindsDB server to make unauthorized requests to internal network resources, potentially accessing sensitive internal services or data.

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How can this vulnerability impact me? :

This vulnerability can be exploited remotely to perform unauthorized internal network requests from the MindsDB server.

• It can lead to unauthorized access to internal metadata services.
• It may cause information disclosure of sensitive internal data.
• It enables attackers to pivot deeper into the internal network, potentially compromising other systems.
• The vulnerability impacts the confidentiality, integrity, and availability of the system.

A proof-of-concept exploit is publicly available, making it easier for attackers to leverage this vulnerability.

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How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:

I don't know

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How can this vulnerability be detected on my network or system? Can you suggest some commands?

[{'type': 'paragraph', 'content': 'This vulnerability involves Server-Side Request Forgery (SSRF) through the MindsDB file upload functionality by exploiting improper URL validation. Detection can focus on monitoring unexpected outbound requests from the MindsDB server to internal or unauthorized network resources, especially requests containing userinfo in URLs.'}, {'type': 'paragraph', 'content': 'To detect potential exploitation attempts, you can monitor network traffic for suspicious HTTP requests originating from the MindsDB server that include userinfo in URLs (e.g., URLs with the format http://user@host).'}, {'type': 'paragraph', 'content': 'Suggested commands for detection include:'}, {'type': 'list_item', 'content': 'Use network monitoring tools like tcpdump or Wireshark to capture outbound HTTP requests from the MindsDB server and filter for suspicious URL patterns.'}, {'type': 'list_item', 'content': "Example tcpdump command to capture HTTP traffic from the server: sudo tcpdump -i <interface> -A 'tcp port 80 or tcp port 443 and src host <mindsdb_server_ip>'"}, {'type': 'list_item', 'content': "Search MindsDB logs for file upload requests containing URLs with userinfo segments (e.g., using grep): grep -r 'http://.*@' /path/to/mindsdb/logs/"}, {'type': 'list_item', 'content': 'Check for unusual internal network requests that should not normally be made by the server, especially to localhost or internal IP ranges.'}] [2, 3]

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What immediate steps should I take to mitigate this vulnerability?

The primary and recommended mitigation is to apply the official patch that fixes the SSRF vulnerability by correcting the URL validation logic in MindsDB.

Specifically, update MindsDB to include the patch identified by commit 74d6f0fd4b630218519a700fbee1c05c7fd4b1ed, which replaces the use of urlparse().netloc with urlparse().hostname and port for origin validation, effectively preventing SSRF bypass via userinfo in URLs.

If immediate patching is not possible, consider restricting outbound network access from the MindsDB server to only trusted destinations using firewall rules or network segmentation to limit potential SSRF exploitation.

Additionally, monitor logs and network traffic for suspicious activity as a temporary detection measure until the patch is applied.

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