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CVE-2026-94623— vLLM through 0.29.0 Denial of Service via NIXL Multi-Prompt Assertion Failure

Quick assessment

Affected
vllm-project vllm
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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

CVSS 7.5 · High EPSS 0.45% · P38

Affected Version Matrix 1

VendorProduct Version RangeStatus
vllm-project vllm ≤ 0.29.0 affected
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I. Basic Information for CVE-2026-94623

Vulnerability Information

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Vulnerability Title
vLLM through 0.29.0 Denial of Service via NIXL Multi-Prompt Assertion Failure
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
可达断言
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
vllm-project vllm 0 ~ 0.29.0 -

II. Public POCs for CVE-2026-94623

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III. Intelligence Information for CVE-2026-94623

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Patches & Fixes for CVE-2026-94623 (1)

Other References for CVE-2026-94623 (1)

Other References for CVE-2026-94623 (1)

Same Patch Batch · vllm-project · 2026-09-21 · 6 CVEs total

CVE-2026-94627 7.5 HIGH vLLM through 0.29.0 GPU KV Cache Leak via Mooncake Transfer ID Collision
CVE-2026-94624 7.5 HIGH vLLM through 0.29.0 Denial of Service via Unbounded P2P KV Offloading Sessions
CVE-2026-94626 7.5 HIGH vLLM through 0.29.0 Memory Exhaustion via Unvalidated NIXL tp_size
CVE-2026-94622 7.5 HIGH vLLM through 0.29.0 Denial of Service via Incomplete NIXL KV Transfer Metadata
CVE-2026-94625 5.3 MEDIUM vLLM through 0.29.0 Resource Exhaustion via Ownerless Mooncake Transfer Placeholders

IV. Related Vulnerabilities

Same product: vllm
Same vendor: vllm-project
Same weakness: CWE-617

V. Comments for CVE-2026-94623

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