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 in the disaggregated-serving peer communication path, specifically the handle_zmq_recv coroutine in the engine connection logic, which receives peer-to-peer cache-free requests using a Python object deserialization routine that invokes pickle.loads() on received data. Type validation against the expected DistServeCacheFreeRequest object occurs only after deserialization has already completed, making the check ineffective as a security boundary. The source of the serialized data is attacker-controllable because the peer connection workflow accepts a remote engine ZMQ address from API input and uses it to establish the peer connection. In deployments where the relevant API endpoints are exposed without configured API key authentication, a remote attacker can cause the engine to connect to an attacker-controlled endpoint and deserialize malicious 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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No public exploit code observed for this vulnerability.
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Cross-references every affected SKU, including bundled OEM variants.
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