EUVD-2026-22191CVSS VectorNVD
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Lifecycle Timeline
2DescriptionNVD
MaxKB is an open-source AI assistant for enterprise. In versions 2.7.1 and below, an authenticated user can bypass sandbox result validation and spoof tool execution results by exploiting Python frame introspection to read the wrapper's UUID from its bytecode constants, then writing a forged result directly to file descriptor 1 (bypassing stdout redirection). By calling sys.exit(0), the attacker terminates the wrapper before it prints the legitimate output, causing the MaxKB service to parse and trust the spoofed response as the genuine tool result. This issue has been fixed in version 2.8.0.
AnalysisAI
MaxKB versions 2.7.1 and below allow authenticated users to spoof tool execution results by exploiting Python frame introspection to extract the wrapper's UUID from bytecode, then writing forged output directly to file descriptor 1 to bypass stdout redirection and terminate the wrapper process before legitimate output is generated, causing the service to trust the attacker-controlled response. This integrity bypass requires prior authentication and local/network access but enables attackers to manipulate AI tool results without detection. …
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