Denial of Service Vulnerability in vLLM Product by vLLM Project
CVE-2026-94622

8.7HIGH

Key Information:

Vendor

Vllm-project

Status
Vllm
Vendor
CVE Published:
21 September 2026

What is CVE-2026-94622?

The vLLM product, specifically versions through 0.29.0, is susceptible to a denial of service vulnerability linked to the NIXL connector's handling of metadata during prefill and decode in disaggregated deployments. An attacker may exploit this vulnerability by sending requests containing incomplete entries in the kv_transfer_params dictionary. This can result in an uncaught KeyError occurring within the EngineCore scheduling process, ultimately leading to the termination of the decode engine. Consequently, all routed requests will fail until the affected services are manually restarted.

Affected Version(s)

vllm 0 <= 0.29.0

References

https://github.com/vllm-project/vllm/pull/54807
issue-trackingpatch
https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/di...
technical-description
https://github.com/vllm-project/vllm
product

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Mingkai Yu
Jiapeng Li
Jiajia Liu
.