vllm-project vLLM up to 0.29.0 NIXL connector kv_transfer_params denial of service

Summaryinfo

A vulnerability was found in vllm-project vLLM up to 0.29.0. It has been classified as problematic. This impacts an unknown function of the component NIXL connector. The manipulation of the argument kv_transfer_params leads to denial of service. This vulnerability is traded as CVE-2026-94622. It is possible to initiate the attack remotely. There is no exploit available.

Detailsinfo

A vulnerability was found in vllm-project vLLM up to 0.29.0. It has been rated as problematic. This issue affects an unknown code block of the component NIXL connector. The manipulation of the argument kv_transfer_params with an unknown input leads to a denial of service vulnerability. Using CWE to declare the problem leads to CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. Impacted is availability. The summary by CVE is:

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.

The advisory is shared at github.com. The identification of this vulnerability is CVE-2026-94622 since 09/21/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1499 for this issue.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Type

• Project Management Software

Vendor

• vllm-project

Name

• vLLM

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18
• 0.19
• 0.20
• 0.21
• 0.22
• 0.23
• 0.24
• 0.25
• 0.26
• 0.27
• 0.28
• 0.29.0

Website

• Product: https://github.com/vllm-project/vllm/

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CPE 2.2info

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Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

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