Vulnerability Instance

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{
    "url": "http://public2.vulnerablecode.io/api/vulnerabilities/37334?format=api",
    "vulnerability_id": "VCID-jzjy-kj6h-4bas",
    "summary": "vLLM is an inference and serving engine for large language models (LLMs). From  to before 0.20.0, the extract_hidden_states speculative decoding proposer in vLLM returns a tensor with an incorrect shape after the first decode step, causing a RuntimeError that crashes the EngineCore process. The crash is triggered when any request in the batch uses sampling penalty parameters (repetition_penalty, frequency_penalty, or presence_penalty). A single request with a penalty parameter (e.g., \"repetition_penalty\": 1.1) is sufficient to crash the server. This vulnerability is fixed in 0.20.0.",
    "aliases": [
        {
            "alias": "CVE-2026-44223"
        },
        {
            "alias": "GHSA-83vm-p52w-f9pw"
        },
        {
            "alias": "PYSEC-2026-145"
        }
    ],
    "fixed_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/50315?format=api",
            "purl": "pkg:pypi/vllm@0.20.0",
            "is_vulnerable": false,
            "affected_by_vulnerabilities": [],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/vllm@0.20.0"
        }
    ],
    "affected_packages": [
        {
            "url": "http://public2.vulnerablecode.io/api/packages/49118?format=api",
            "purl": "pkg:pypi/vllm@0.18.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-jzjy-kj6h-4bas"
                },
                {
                    "vulnerability": "VCID-za3a-c9m1-jqgz"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/vllm@0.18.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/49119?format=api",
            "purl": "pkg:pypi/vllm@0.18.1",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-jzjy-kj6h-4bas"
                },
                {
                    "vulnerability": "VCID-za3a-c9m1-jqgz"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/vllm@0.18.1"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/49120?format=api",
            "purl": "pkg:pypi/vllm@0.19.0",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-jzjy-kj6h-4bas"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/vllm@0.19.0"
        },
        {
            "url": "http://public2.vulnerablecode.io/api/packages/50314?format=api",
            "purl": "pkg:pypi/vllm@0.19.1",
            "is_vulnerable": true,
            "affected_by_vulnerabilities": [
                {
                    "vulnerability": "VCID-jzjy-kj6h-4bas"
                }
            ],
            "resource_url": "http://public2.vulnerablecode.io/packages/pkg:pypi/vllm@0.19.1"
        }
    ],
    "references": [
        {
            "reference_url": "https://github.com/vllm-project/vllm",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://github.com/vllm-project/vllm"
        },
        {
            "reference_url": "https://github.com/vllm-project/vllm/pull/38610",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://github.com/vllm-project/vllm/pull/38610"
        },
        {
            "reference_url": "https://github.com/vllm-project/vllm/security/advisories/GHSA-83vm-p52w-f9pw",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://github.com/vllm-project/vllm/security/advisories/GHSA-83vm-p52w-f9pw"
        },
        {
            "reference_url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44223",
            "reference_id": "",
            "reference_type": "",
            "scores": [
                {
                    "value": "6.5",
                    "scoring_system": "cvssv3.1",
                    "scoring_elements": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "value": "MODERATE",
                    "scoring_system": "generic_textual",
                    "scoring_elements": ""
                }
            ],
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44223"
        }
    ],
    "weaknesses": [
        {
            "cwe_id": 131,
            "name": "Incorrect Calculation of Buffer Size",
            "description": "The product does not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow."
        },
        {
            "cwe_id": 704,
            "name": "Incorrect Type Conversion or Cast",
            "description": "The product does not correctly convert an object, resource, or structure from one type to a different type."
        }
    ],
    "exploits": [],
    "severity_range_score": "4.0 - 6.9",
    "exploitability": "0.5",
    "weighted_severity": "6.2",
    "risk_score": 3.1,
    "resource_url": "http://public2.vulnerablecode.io/vulnerabilities/VCID-jzjy-kj6h-4bas"
}