{"cve":"CVE-2026-56340","nvd":{"published":"2026-06-20T19:16:23.567","modified":"2026-10-23T23:10:00.157","status":"Modified","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.","cvss_v4":{"vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N","score":8.7},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5},"cwes":["CWE-20","CWE-787"],"references":["https://github.com/vllm-project/vllm/security/advisories/GHSA-mcmc-2m55-j8jj","https://www.vulncheck.com/advisories/vllm-denial-of-service-via-unvalidated-multimodal-embeddings","https://access.redhat.com/security/cve/CVE-2026-56340","https://bugzilla.redhat.com/show_bug.cgi?id=2491060","https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-56340.json"],"products":["vllm:vllm"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-56340","score":0.00644,"percentile":0.50583,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-mcmc-2m55-j8jj","url":"https://osv.dev/vulnerability/GHSA-mcmc-2m55-j8jj","summary":"vLLM introduced enhanced protection for CVE-2025-62164","modified":"2026-09-11T19:30:05.031389969Z","packages":[{"ecosystem":"PyPI","name":"vllm","purl":"pkg:pypi/vllm","ranges":[">=0.10.2 <0.13.0"],"fixed":["0.13.0"]}]},{"id":"PYSEC-2026-250","url":"https://osv.dev/vulnerability/PYSEC-2026-250","summary":"","modified":"2026-06-27T11:15:06.806708965Z","packages":[{"ecosystem":"PyPI","name":"vllm","purl":"pkg:pypi/vllm","ranges":[">=0.10.2 <0.13.0"],"fixed":["0.13.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}