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CVE-2026-76850 is a remote code execution vulnerability in InternLM LMDeploy affecting versions 0.9.2 and later before 0.16.0. The flaw is caused by unsafe deserialization of peer-to-peer messages in the disaggregated-serving component. In the vulnerable code path, the handle_zmq_recv coroutine in the disaggregated connection logic reads peer messages using recv_pyobj(), which deserializes attacker-supplied data with Python pickle before any effective type validation occurs. Although the code later checks whether the resulting object is a DistServeCacheFreeRequest instance, that validation happens only after deserialization has already completed. The peer endpoint supplying the serialized data is attacker-controllable because the disaggregated-serving connection workflow accepts a remote ZMQ address from request data and uses it to establish the peer connection. When the relevant API endpoints are exposed without authentication, which occurs by default unless API keys are explicitly configured, a remote attacker can cause the engine to connect to a malicious endpoint and deserialize crafted pickle data, resulting in arbitrary code execution in the engine process. Deployments that do not enable disaggregated serving are not affected.
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Cross-references every affected SKU, including bundled OEM variants.
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