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CVE-2026-56340

Full vulnerability record from the local CVENow database.

Description

vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing. Because PyTorch disables sparse tensor invariant checks by default, an attacker can submit crafted embedding requests with malformed (negative or out-of-bounds) tensor indices, when the prompt-embeds feature is enabled, to trigger crashes or resource exhaustion (denial of service), with potential for out-of-bounds/write-what-where memory corruption. This continues CVE-2025-62164, whose prior fix only disabled the feature by default rather than addressing the root cause.

Severity
HIGH
CVSS score
8.7 (v4.0)
Vulnerability status
Modified
Source identifier
[email protected]
Published
2026-06-20 19:16:23.567000
Last modified
2026-10-23 23:10:00.157000
View original CVE JSON 
{
  "id": "CVE-2026-56340",
  "sourceIdentifier": "[email protected]",
  "published": "2026-06-20T19:16:23.567",
  "lastModified": "2026-10-23T23:10:00.157",
  "vulnStatus": "Modified",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing. Because PyTorch disables sparse tensor invariant checks by default, an attacker can submit crafted embedding requests with malformed (negative or out-of-bounds) tensor indices, when the prompt-embeds feature is enabled, to trigger crashes or resource exhaustion (denial of service), with potential for out-of-bounds/write-what-where memory corruption. This continues CVE-2025-62164, whose prior fix only disabled the feature by default rather than addressing the root cause."
    },
    {
      "lang": "es",
      "value": "Las versiones de vLLM >= 0.10.2 y anterior a 0.13.0 carecen de validación de tensores dispersos en el procesamiento de incrustaciones multimodales. Debido a que PyTorch deshabilita las comprobaciones de invariantes de tensores dispersos por defecto, un atacante puede enviar solicitudes de incrustación manipuladas con índices de tensor malformados (negativos o fuera de límites), cuando la característica 'prompt-embeds' está habilitada, para provocar fallos o agotamiento de recursos (denegación de servicio), con potencial de corrupción de memoria fuera de límites/escritura-arbitraria. Esto continúa CVE-2025-62164, cuya corrección anterior solo deshabilitó la característica por defecto en lugar de abordar la causa raíz."
    }
  ],
  "affected": [
    {
      "source": "[email protected]",
      "affectedData": [
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          "product": "vLLM",
          "defaultStatus": "unaffected",
          "packageURL": "pkg:pypi/vllm",
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              "version": "0.10.2",
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              "versionType": "semver",
              "status": "affected"
            },
            {
              "version": "0.13.0",
              "versionType": "semver",
              "status": "unaffected"
            }
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        }
      ]
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          "exploitMaturity": "NOT_DEFINED",
          "confidentialityRequirement": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "availabilityRequirement": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
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          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "valueDensity": "NOT_DEFINED",
          "vulnerabilityResponseEffort": "NOT_DEFINED",
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