CVE-2026-94623

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-94623
vLLM through 0.29.0 contains a denial of service vulnerability in the NIXL connector's prefix caching implementation that fails to properly validate block counts across multi-prompt completion requests in prefill/decode disaggregated deployments. Attackers can trigger an assertion failure in NixlBaseConnectorWorker._apply_prefix_caching by submitting completion requests with multiple prompts of varying lengths, causing the decode worker to terminate and become unavailable until restarted.

7.5 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 3.9 / Impact : 3.6

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/vllm-project/vllm Product
https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/base_worker.py#L2642-L2646 Product
https://github.com/vllm-project/vllm/pull/51505 Issue Tracking Patch
https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-nixl-multi-prompt-assertion-failure Third Party Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*
History

29 Sep 2026, 12:47

Type Values Removed Values Added
References () https://github.com/vllm-project/vllm - () https://github.com/vllm-project/vllm - Product
References () https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/base_worker.py#L2642-L2646 - () https://github.com/vllm-project/vllm/blob/v0.29.0/vllm/distributed/kv_transfer/kv_connector/v1/nixl/base_worker.py#L2642-L2646 - Product
References () https://github.com/vllm-project/vllm/pull/51505 - () https://github.com/vllm-project/vllm/pull/51505 - Issue Tracking, Patch
References () https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-nixl-multi-prompt-assertion-failure - () https://www.vulncheck.com/advisories/vllm-through-0.29.0-denial-of-service-via-nixl-multi-prompt-assertion-failure - Third Party Advisory
First Time Vllm vllm
Vllm
CPE cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*

21 Sep 2026, 22:17

Type Values Removed Values Added
New CVE
Information

Published : 2026-09-21 22:17

Updated : 2026-09-29 12:47

NVD link : CVE-2026-94623

Mitre link : CVE-2026-94623

CVE.ORG link : CVE-2026-94623

JSON object : View

Products Affected

vllm

  • vllm
CWE
CWE-617

Reachable Assertion