{"id":"CVE-2026-116180","title":"vLLM from 0.8.5 before 0.31.0 Cross-Tenant DoS via Uninitialized LogprobsTensors","summary":"vLLM from 0.8.5 before 0.31.0 has a denial of service flaw. LogprobsTensors.empty_cpu() in vllm/v1/outputs.py allocates an uninitialized int32 tensor, and the V1 model runner leaves prompt positions reported as computed by a KV connector…","severity":"high","cvss":7.7,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H","cvssSource":"cna","cwe":["CWE-908"],"vendor":"vllm-project","product":"vllm","affected":["vllm >= 0.8.5 < 0.31.0"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-26T19:38:04.390533Z"},"published":"2026-10-25","updated":"2026-10-26","sourceUpdated":"2026-10-26T19:48:35.789Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-116180","references":[{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-rhcx-5729-88vg","label":"GitHub Security Advisory (GHSA-rhcx-5729-88vg)"},{"url":"https://www.vulncheck.com/advisories/vllm-from-0.8.5-before-0.31.0-cross-tenant-dos-via-uninitialized-logprobstensors","label":"VulnCheck Advisory: vLLM from 0.8.5 before 0.31.0 Cross-Tenant DoS via Uninitialized LogprobsTensors"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-116180.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-116180"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2560429"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-116180"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-116180"}],"tags":["cve.org","csaf","vex","red-hat"],"epss":0.00249,"epssPercentile":0.16108,"scores":{"cna":7.7,"vendor":6.5},"ingestedAt":"2026-10-25T22:08:29.945Z","slug":"CVE-2026-116180","body":"## Overview\n\nvLLM from 0.8.5 before 0.31.0 has a denial of service flaw. LogprobsTensors.empty_cpu() in vllm/v1/outputs.py allocates an uninitialized int32 tensor, and the V1 model runner leaves prompt positions reported as computed by a KV connector unwritten. A client sharing the engine can send prompt_logprobs (or echo with logprobs) against a connector-cached prefix, making tokenizer decode raise OverflowError, which crashes EngineCore and drops all co-tenant requests.\n\n## Affected\n\n- `vllm >= 0.8.5 < 0.31.0`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3, Red Hat OpenShift AI (RHOAI) · no fix planned: Red Hat OpenShift AI (RHOAI), Red Hat AI Inference Server, Red Hat Enterprise Linux AI (RHEL AI) 3 · updated 2026-10-26 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-116180.json)","depth":"twilight","depthScore":42,"depthScoreParts":{"impact":42.4,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[{"seq":229763,"id":"CVE-2026-116180","ts":1793047353261,"field":"cvss","old":"6.5","new":"7.7"},{"seq":229762,"id":"CVE-2026-116180","ts":1793047353261,"field":"severity","old":"medium","new":"high"},{"seq":229404,"id":"CVE-2026-116180","ts":1793019744764,"field":"cvss","old":"7.7","new":"6.5"},{"seq":229403,"id":"CVE-2026-116180","ts":1793019744764,"field":"severity","old":"high","new":"medium"}]}