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vllm: vLLM: Cross-User Data Leakage via Integer Overflow

cve CVE-2026-73558 2 sources, 2 claims · Watch

Red Hat writes:
vllm: vLLM: Cross-User Data Leakage via Integer Overflow the claim
Severity
MEDIUM NVD
moderate Red Hat
CVSS
5.3 NVD
5.3 Red Hat
Vendor
vllm-project NVD
Product
vllm NVD
CWE
CWE-190 NVD
CWE-190 Red Hat

How far exploitation has got

  1. No public code known
  2. Proof of concept
  3. Proof of concept, verified
  4. A Metasploit module
  5. Exploited in the wild
  6. Used in ransomware campaigns

Timeline

2026-08-13first spoke of it: vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0.NVD
2026-08-13first spoke of it: vllm: vLLM: Cross-User Data Leakage via Integer OverflowRed Hat

What it is to other things

affectsvllm/vllm
NVD
made_byvllm
NVD

In words only, so not counted until a person confirms one:

made_byvllm_project
NVD says “vllm-project”
affectsvllm_project/vllm
NVD says “vllm-project · vllm”
Every value, with what each source said and its receipt
PropertySourceSaidMeans here
Automatable
automatable
NVDno
At least one of those steps needs a person.
receipt
Source
NVD
Its words
no
Read by
field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTCno
2026-09-29 09:39 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "vllm",
            "vendor": "vllm-project",
            "versions": [
              {
                "status": "affected",
                "version": "< 0.27.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*",
                "matchCriteriaId": "DCC9D12D-2023-4198-AAA2-7F07FC7D669B",
                "versionEndExcluding": "0.27.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0."
      }
    ],
    "id": "CVE-2026-73558",
    "lastModified": "2026-09-28T18:41:49.083",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          },
          "exploitabilityScore": 1.6,
          "impactScore": 3.6,
          "source": "security-advisories@github.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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            ],
            "role": "CISA Coordinator",
            "timestamp": "2026-08-13T15:38:18.767062Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2026-08-13T15:20:18.220",
    "references": [
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        "source": "security-advisories@github.com",
        "tags": [
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        "url": "https://github.com/vllm-project/vllm/commit/451227cb3ff07989698fed982c2d3e4300257924"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Issue Tracking",
          "Patch"
        ],
        "url": "https://github.com/vllm-project/vllm/issues/42860"
      },
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        "source": "security-advisories@github.com",
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        "url": "https://github.com/vllm-project/vllm/pull/49660"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Release Notes"
        ],
        "url": "https://github.com/vllm-project/vllm/releases/tag/v0.27.0"
      },
      {
        "source": "security-advisories@github.com",
        "tags": [
          "Exploit",
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        "url": "https://github.com/vllm-project/vllm/security/advisories/GHSA-7m6h-x95x-82q5"
      },
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      }
    ],
    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-190"
          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CVSS
cvss
NVD5.3
receipt
Source
NVD
Its words
5.3
Read by
field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-09-29 09:39 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "vllm",
            "vendor": "vllm-project",
            "versions": [
              {
                "status": "affected",
                "version": "< 0.27.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
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                "versionEndExcluding": "0.27.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0."
      }
    ],
    "id": "CVE-2026-73558",
    "lastModified": "2026-09-28T18:41:49.083",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
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          "type": "Secondary"
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            "role": "CISA Coordinator",
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            "version": "2.0.3"
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    },
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    "references": [
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    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
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          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CVSS
cvss
Red Hat5.3
receipt
Source
Red Hat
Its words
5.3
Read by
field:cvss3_score
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-06 13:02 UTC
Original
open at the source
What the source handed over
{
  "CVE": "CVE-2026-73558",
  "CWE": "CWE-190",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2515383",
  "bugzilla_description": "vllm: vLLM: Cross-User Data Leakage via Integer Overflow",
  "cvss3_score": "5.3",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-08-13T15:06:06Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-73558.json",
  "severity": "moderate"
}
—
CVSS vector
cvss_vector
NVDCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
receipt
Source
NVD
Its words
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Read by
field:cve.metrics.cvssMetricV31[type=Primary].cvssData.vectorString || field:cve.metrics.cvssMetricV31[].cvssData.vectorString
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTCCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
2026-09-29 09:39 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "vllm",
            "vendor": "vllm-project",
            "versions": [
              {
                "status": "affected",
                "version": "< 0.27.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
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              {
                "criteria": "cpe:2.3:a:vllm:vllm:*:*:*:*:*:*:*:*",
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                "versionEndExcluding": "0.27.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
        ]
      }
    ],
    "cveTags": [],
    "descriptions": [
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        "value": "vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0."
      }
    ],
    "id": "CVE-2026-73558",
    "lastModified": "2026-09-28T18:41:49.083",
    "metrics": {
      "cvssMetricV31": [
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      },
      {
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        ],
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    "sourceIdentifier": "security-advisories@github.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
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          }
        ],
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CVSS vector
cvss_vector
Red HatCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
receipt
Source
Red Hat
Its words
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
Read by
field:cvss3_scoring_vector
Said since
2026-10-06 13:01 UTC
Last answered
2026-10-06 13:02 UTC
Original
open at the source
2026-10-06 13:01 UTCCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N
2026-09-29 09:44 UTC—
What the source handed over
{
  "CVE": "CVE-2026-73558",
  "CWE": "CWE-190",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2515383",
  "bugzilla_description": "vllm: vLLM: Cross-User Data Leakage via Integer Overflow",
  "cvss3_score": "5.3",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
  "cvss_score": null,
  "cvss_scoring_vector": null,
  "package_state": null,
  "public_date": "2026-08-13T15:06:06Z",
  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-73558.json",
  "severity": "moderate"
}
—
CWE
cwe
NVDCWE-190
receipt
Source
NVD
Its words
CWE-190
Read by
field:cve.weaknesses[].description[].value
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTCCWE-190
2026-09-29 09:39 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "product": "vllm",
            "vendor": "vllm-project",
            "versions": [
              {
                "status": "affected",
                "version": "< 0.27.0"
              }
            ]
          }
        ],
        "source": "security-advisories@github.com"
      }
    ],
    "configurations": [
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                "matchCriteriaId": "DCC9D12D-2023-4198-AAA2-7F07FC7D669B",
                "versionEndExcluding": "0.27.0",
                "vulnerable": true
              }
            ],
            "negate": false,
            "operator": "OR"
          }
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    ],
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      }
    ],
    "id": "CVE-2026-73558",
    "lastModified": "2026-09-28T18:41:49.083",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "HIGH",
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            "availabilityImpact": "NONE",
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
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          "impactScore": 3.6,
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      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
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              },
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              }
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    },
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    "references": [
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        "tags": [
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      },
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          "Patch"
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—
CWE
cwe
Red HatCWE-190
receipt
Source
Red Hat
Its words
CWE-190
Read by
field:CWE
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-06 13:02 UTC
Original
open at the source
What the source handed over
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  "severity": "moderate"
}
—
Exploitation
exploitation
NVDpoc
A public proof of concept exists, or exploitation is trivial.
receipt
Source
NVD
Its words
poc
Read by
field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTCpoc
2026-09-29 09:39 UTC—
What the source handed over
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}
—
Product
product
NVDvllm
receipt
Source
NVD
Its words
vllm
Read by
field:cve.affected[].affectedData[].product
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-09-29 17:49 UTCvllm
2026-09-29 09:39 UTC—
What the source handed over
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—
Severity
severity
NVDMEDIUM
From 4.0 to 6.9.
receipt
Source
NVD
Its words
MEDIUM
Read by
field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTCMEDIUM
2026-09-29 09:39 UTC—
What the source handed over
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medium
Severity
severity
Red Hatmoderate
A flaw that is harder to exploit, or whose impact is limited.
receipt
Source
Red Hat
Its words
moderate
Read by
field:severity
Said since
2026-09-29 09:44 UTC
Last answered
2026-10-06 13:02 UTC
Original
open at the source
What the source handed over
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  "CWE": "CWE-190",
  "advisories": [],
  "affected_packages": [],
  "bugzilla": "2515383",
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  "cvss3_score": "5.3",
  "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N",
  "cvss_score": null,
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  "package_state": null,
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  "resource_url": "https://access.redhat.com/hydra/rest/securitydata/cve/CVE-2026-73558.json",
  "severity": "moderate"
}
medium
Status
status
NVDAnalyzed
receipt
Source
NVD
Its words
Analyzed
Read by
field:cve.vulnStatus
Said since
2026-09-29 09:39 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
What the source handed over
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            "vendor": "vllm-project",
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        "url": "https://github.com/vllm-project/vllm/security/advisories/GHSA-7m6h-x95x-82q5"
      },
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "tags": [
          "Exploit",
          "Vendor Advisory"
        ],
        "url": "https://github.com/vllm-project/vllm/security/advisories/GHSA-7m6h-x95x-82q5"
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    ],
    "sourceIdentifier": "security-advisories@github.com",
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    "weaknesses": [
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        ],
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        "type": "Secondary"
      }
    ]
  }
}
—
Technical impact
technical_impact
NVDpartial
The attacker gains limited control, or limited information.
receipt
Source
NVD
Its words
partial
Read by
field:cve.metrics.ssvcV203[].ssvcData.options[].technicalImpact
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTCpartial
2026-09-29 09:39 UTC—
What the source handed over
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    ],
    "id": "CVE-2026-73558",
    "lastModified": "2026-09-28T18:41:49.083",
    "metrics": {
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        "type": "Secondary"
      }
    ]
  }
}
—
Vendor
vendor
NVDvllm-project
receipt
Source
NVD
Its words
vllm-project
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-09-29 17:49 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-09-29 17:49 UTCvllm-project
2026-09-29 09:39 UTC—
What the source handed over
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      {
        "affectedData": [
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            "product": "vllm",
            "vendor": "vllm-project",
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              }
            ],
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    ],
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    "sourceIdentifier": "security-advisories@github.com",
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        "type": "Secondary"
      }
    ]
  }
}
—
Every claim, by kind

vulnerability

vllm: vLLM: Cross-User Data Leakage via Integer Overflow
zetlyn/cve-redhat · 2026-08-13
cvss 5.3 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N cwe CWE-190 severity moderate source
vLLM is an inference and serving engine for large language models. Prior to 0.27.0, an integer overflow in blockIdx.x * 2 * d in activation_kernels.cu can cause act_and_mul_kernel to consume another batched user's input, allowing a request processed in the same inference batch to receive a partial or complete copy of another user's inference result. This issue is fixed in version 0.27.0.
zetlyn/cve-nvd · 2026-08-13
automatable no cvss 5.3 cvss_vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:N/A:N cwe CWE-190 exploitation poc product vllm severity MEDIUM status Analyzed technical_impact partial vendor vllm-project source