{"id":"CVE-2026-56340","title":"vLLM versions >= 0.10.2 and < 0.13.0 are missing sparse tensor validation in multimodal embeddings processing","summary":"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 mal…","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-20","CWE-787"],"vendor":"vllm","product":"vllm","affected":["vllm >= 0.10.2, < 0.13.0"],"patched":["vllm 0.13.0"],"published":"2026-06-20","updated":"2026-07-15","sourceUpdated":"2026-07-15T01:16:38.343","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-56340","references":[{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-mcmc-2m55-j8jj","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vllm-denial-of-service-via-unvalidated-multimodal-embeddings","label":"disclosure@vulncheck.com"},{"url":"https://access.redhat.com/security/cve/CVE-2026-56340","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2491060","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56340.json","label":"0b0ca135-0b70-47e7-9f44-1890c2a1c46c"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-06-24T15:54:59.666959Z"},"ingestedAt":"2026-09-14T00:23:31.573Z","epss":0.00644,"epssPercentile":0.49451,"slug":"CVE-2026-56340","body":"## Overview\n\nvLLM 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.\n\n## Affected\n\n- `vllm >= 0.10.2, < 0.13.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `vllm 0.13.0`","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}