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The CVE-2025-XXXXX vulnerability in Modular Max Serve stems from improper deserialization of user-supplied data when the ‘–experimental-enable-kvcache-agent’ feature flag is active. The application deserializes untrusted data without adequate validation, using insecure functions like `pickle.loads()` or similar. An attacker can craft a malicious serialized object containing arbitrary code. When this object is deserialized by the vulnerable server, the embedded code is executed within the application’s context, with the same permissions as the server process. This occurs because the deserialization process reconstructs objects and executes their associated methods, allowing for remote code execution without authentication.
Platform: Modular Max Serve
Version: < 25.6
Vulnerability: Unsafe Deserialization
Severity: Critical
date: 2025-11-18
Prediction: Patch by 2025-11-25
What Undercode Say:
`curl -s “http://target:port/endpoint” -H “Content-Type: application/python-pickle” –data-binary @malicious.pickle`
`python3 -c “import pickle, os; pickle.dumps(os.system(‘id’))”`
`./max-serve –experimental-enable-kvcache-agent`
How Exploit:
Craft malicious pickle payload. Send via POST request. Achieve remote code execution.
Protection from this CVE
Disable the experimental feature. Upgrade to version 25.6. Implement input sanitization.
Impact:
Remote Code Execution. Complete System Compromise. Bypass Authentication.
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Sources:
Reported By: github.com
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