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This vulnerability exploits a insecure deserialization flaw within the SnakeYAML library used by the HummerRisk platform. Attackers with standard user credentials can send a specially crafted YAML payload to the `/rule/add` API endpoint. When processed, the vulnerable SnakeYAML component deserializes this payload without proper restrictions. This allows the payload to instantiate malicious Java classes or execute constructor methods embedded within the YAML structure. Successful exploitation grants the attacker the ability to run arbitrary operating system commands on the underlying server with the privileges of the HummerRisk application process. This results in full Remote Code Execution (RCE), enabling server takeover, data theft, and further network compromise.
Platform: HummerRisk
Version: Through v1.5.0
Vulnerability: Insecure Deserialization RCE
Severity: High
date: 2025-12-08
Prediction: Patch not released
What Undercode Say:
Analytics
– `curl -X POST http://
– Search for `org.yaml.snakeyaml.Yaml.load()` calls in source code.
– Monitor system logs for suspicious process spawns from the HummerRisk Java process.
How Exploit:
1. Attacker obtains valid low-privilege user credentials.
- Crafts a YAML payload containing malicious Java class constructors.
- Sends payload via authenticated POST request to the `/rule/add` API.
- Vulnerable SnakeYAML parser executes the embedded code on server.
Protection from this CVE
- Upgrade HummerRisk immediately.
- Restrict API endpoint access.
- Implement network segmentation controls.
- Apply strict input validation.
Impact:
- Full server compromise.
- Arbitrary code execution.
- Complete system access.
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Sources:
Reported By: nvd.nist.gov
Extra Source Hub:
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