HIGH8.7

PYSEC-2026-4004

Quick fix

PYSEC-2026-4004 — vllm: upgrade to the fixed version with the command below.

pip install --upgrade 'vllm>=0.30.0'

Details

vLLM versions through 0.29.0 contain a denial of service vulnerability in the NIXL connector's metadata handling for prefill/decode disaggregated deployments. Attackers can send requests with incomplete kv_transfer_params dictionary entries to trigger an uncaught KeyError in EngineCore scheduling, causing the decode engine to terminate and making all routed requests fail until manual restart.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/vllm

Introduced in: 0Fixed in: 0.30.0

Fixpip install --upgrade 'vllm>=0.30.0'

References

https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/metadata.py#L294-L312[WEB]
https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-incomplete-nixl-kv-transfer-metadata[ADVISORY]
https://github.com/vllm-project/vllm/pull/54807[FIX]
https://github.com/vllm-project/vllm[PACKAGE]