{"id":"CVE-2026-109227","state":"PUBLISHED","title":"SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing","description":"SGLang through 0.5.21 contains an unbounded memory allocation vulnerability in preprocess_video in qwen_vl.py that decodes frames at full source resolution before applying max_pixels limits. Remote attackers can submit high-resolution videos to /v1/chat/completions on Qwen-VL deployments, and concurrent requests exhaust worker memory causing denial of service.","publishedAt":"2026-10-12T14:04:31.362Z","updatedAt":"2026-10-18T11:46:21.400Z","severity":{"score":8.7,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","source":"VulnCheck"},"assigner":"VulnCheck","products":["sgl-project sglang"],"affected":[{"vendor":"sgl-project","product":"sglang","packageURL":"pkg:pypi/sglang","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.5.21","versionType":"semver"}],"repo":"https://github.com/sgl-project/sglang","collectionURL":"https://pypi.org/project/sglang"}],"references":["https://github.com/sgl-project/sglang/issues/43710","https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306","https://github.com/sgl-project/sglang","https://www.vulncheck.com/advisories/sglang-through-0.5.21-memory-exhaustion-dos-via-qwen-vl-video-preprocessing"],"weaknesses":["CWE-770"],"ingestedAt":"2026-10-29T20:10:33.477Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/109xxx/CVE-2026-109227.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-109227","state":"PUBLISHED","datePublished":"2026-10-12T14:04:31.362Z","dateUpdated":"2026-10-18T11:46:21.400Z","assignerShortName":"VulnCheck","assignerOrgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateReserved":"2026-10-12T13:46:32.999Z"},"containers":{"cna":{"title":"SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing","descriptions":[{"lang":"en","value":"SGLang through 0.5.21 contains an unbounded memory allocation vulnerability in preprocess_video in qwen_vl.py that decodes frames at full source resolution before applying max_pixels limits. Remote attackers can submit high-resolution videos to /v1/chat/completions on Qwen-VL deployments, and concurrent requests exhaust worker memory causing denial of service."}],"affected":[{"vendor":"sgl-project","product":"sglang","packageURL":"pkg:pypi/sglang","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"0.5.21","versionType":"semver"}],"repo":"https://github.com/sgl-project/sglang","collectionURL":"https://pypi.org/project/sglang"}],"references":[{"url":"https://github.com/sgl-project/sglang/issues/43710","tags":["issue-tracking"],"name":"GitHub Issue #43710"},{"url":"https://github.com/sgl-project/sglang/blob/v0.5.21/python/sglang/srt/multimodal/processors/qwen_vl.py#L267-L306","tags":["technical-description"]},{"url":"https://github.com/sgl-project/sglang","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/sglang-through-0.5.21-memory-exhaustion-dos-via-qwen-vl-video-preprocessing","name":"VulnCheck Advisory: SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing","tags":["third-party-advisory"]}],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"NONE","vulnConfidentialityImpact":"NONE","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":8.7,"baseSeverity":"HIGH"}},{"format":"CVSS","cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-770","lang":"en","description":"Allocation of Resources Without Limits or Throttling","type":"CWE"}]}],"providerMetadata":{"shortName":"VulnCheck","orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","dateUpdated":"2026-10-12T14:04:31.362Z"},"datePublic":"2026-10-11T00:00:00.000Z","cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:lmsys:sglang:*:*:*:*:*:*:*:*","versionEndIncluding":"0.5.21"}]}]}],"credits":[{"lang":"en","value":"Jiapeng Li","type":"finder"},{"lang":"en","value":"Jiajia Liu","type":"finder"},{"lang":"en","value":"Jiadai Wang","type":"finder"}],"x_generator":{"engine":"vulncheck-endgame"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/sgl-project/sglang/issues/43710","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-18T11:46:17.742988Z","id":"CVE-2026-109227","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-18T11:46:21.400Z"}}]}}}