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CVE-2026-94623

vLLM through 0.29.0 Denial of Service via NIXL Multi-Prompt Assertion Failure

CVSS 4.0 8.7 HIGHCVSS 3.1 7.5 HIGHCheck source for fixed versionsKEV status unknown

Original advisory

cve-program · CVE-2026-94623

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

cve-program · CVE-2026-94623

Published

vllm

Vendor product

Publisher's version information

Shown as published. These rules are not interpreted as NuGet package version ranges.

{
                    "vendor": "vllm-project",
                    "product": "vllm",
                    "defaultStatus": "unaffected",
                    "packageURL": "pkg:pypi/vllm",
                    "versions": [
                        {
                            "version": "0",
                            "lessThanOrEqual": "0.29.0",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }

Original source record · Cite this exact observation · Complete original publisher JSON