CVE-2025-30165: vLLM unsafe pickle deserialization in multi-node ZeroMQ communication

Summary

CVE-2025-30165 affects vLLM's V0 engine in multi-node deployments that use tensor parallelism. Secondary hosts subscribe to the primary host's XPUB socket over ZeroMQ and deserialize received data with pickle, which can be abused to execute code on a remote machine. The flaw is an escalation point if the primary host is compromised, and it can also be reached without primary-host access, for example through ARP cache poisoning. The V1 engine is not affected.

Mitigation

The maintainers decided not to fix this issue, because V0 has been off by default since v0.8.0 and the fix is fairly invasive. They recommend that users ensure their environment is on a secure network in case this pattern is in use.

Affected packages in the Exposure Registry

Matched by package name and ecosystem. Each entry shows whether the package delegates to a language model and how many tracked packages depend on it.

• vllmPyPILLM dependency since 2023-08-25 · 15 tracked dependents

Topics

• Inference infrastructure

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