{"id":"CVE-2026-78684","title":"vLLM before 0.27.0 fails to properly classify DeepStream as a GPU backend and omits pixel-limit enforcement in its decode path","summary":"vLLM before 0.27.0 fails to properly classify DeepStream as a GPU backend and omits pixel-limit enforcement in its decode path. Unauthenticated attackers can activate DeepStream at request time to initialize the process-wide GPU decode p…","severity":"medium","cvss":5.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","cwe":["CWE-400"],"vendor":"vllm","product":"vllm","affected":["vllm < 0.27.0"],"patched":["vllm 0.27.0"],"published":"2026-08-25","updated":"2026-09-29","sourceUpdated":"2026-09-29T12:52:51.410","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-78684","references":[{"url":"https://github.com/vllm-project/vllm/commit/e23b19309b8705b21c3b3ff4129c9974ba15a419","label":"disclosure@vulncheck.com"},{"url":"https://github.com/vllm-project/vllm/security/advisories/GHSA-cqm8-jxg6-fqfq","label":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/vllm-before-denial-of-service-via-deepstream-backend","label":"disclosure@vulncheck.com"}],"tags":["nvd","osv","pip"],"ingestedAt":"2026-09-14T21:15:17.419Z","epss":0.00608,"epssPercentile":0.48877,"aliases":["PYSEC-2026-4003","GHSA-cqm8-jxg6-fqfq"],"ecosystem":"pip","slug":"CVE-2026-78684","body":"## Overview\n\nvLLM before 0.27.0 fails to properly classify DeepStream as a GPU backend and omits pixel-limit enforcement in its decode path. Unauthenticated attackers can activate DeepStream at request time to initialize the process-wide GPU decode pool and submit video that bypasses resource controls, causing partial denial of service for concurrent requests.\n\n## Affected\n\n- `vllm < 0.27.0`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `vllm 0.27.0`\n\n## Package advisory (CVE-2026-78684)\n\nAffected packages:\n\n- `vllm < 0.27.0`\n\nPatched in:\n\n- `vllm 0.27.0`\n\nSource: https://osv.dev/vulnerability/PYSEC-2026-4003","depth":"sunlit","depthScore":29,"depthScoreParts":{"impact":29.2,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}