{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-93688", "assignerOrgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "state": "PUBLISHED", "assignerShortName": "VulnCheck", "dateReserved": "2026-09-18T14:39:01.470Z", "datePublished": "2026-09-18T15:06:03.530Z", "dateUpdated": "2026-09-18T16:23:59.301Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "83251b91-4cc7-4094-a5c7-464a1b83ea10", "shortName": "VulnCheck", "dateUpdated": "2026-09-18T16:23:59.301Z"}, "title": "SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room", "descriptions": [{"lang": "en", "value": "SGLang through 0.5.19 in prefill/decode disaggregation mode with Mooncake KV transfer backend fails to validate bootstrap_room values, allowing unbounded transfer state allocation. Unauthenticated attackers can reach the decode engine's POST /generate endpoint and submit arbitrary bootstrap_room values to exhaust prefill process memory until out-of-memory termination."}], "datePublic": "2026-09-14T00:00:00.000Z", "problemTypes": [{"descriptions": [{"lang": "en", "cweId": "CWE-770", "description": "Allocation of Resources Without Limits or Throttling", "type": "CWE"}]}], "affected": [{"vendor": "sgl-project", "product": "sglang", "defaultStatus": "unaffected", "packageURL": "pkg:pypi/sglang", "repo": "https://github.com/sgl-project/sglang", "collectionURL": "https://pypi.org/project/sglang", "versions": [{"version": "0", "status": "affected", "versionType": "semver", "lessThanOrEqual": "0.5.19"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:lmsys:sglang:*:*:*:*:*:*:*:*", "versionEndIncluding": "0.5.19"}]}]}], "metrics": [{"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV4_0": {"attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "subConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "subIntegrityImpact": "NONE", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "HIGH", "baseScore": 8.7, "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"}}, {"format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}], "cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "baseSeverity": "HIGH", "baseScore": 7.5, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}}], "references": [{"url": "https://github.com/sgl-project/sglang/issues/39428", "tags": ["issue-tracking"], "name": "GitHub Issue #39428"}, {"url": "https://github.com/sgl-project/sglang", "tags": ["product"]}, {"url": "https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L2118-L2119", "tags": ["technical-description"]}, {"url": "https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L1988-L1990", "tags": ["technical-description"]}, {"url": "https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/io_struct.py#L281", "tags": ["technical-description"]}, {"url": "https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/scheduler.py#L2672-L2690", "tags": ["technical-description"]}, {"name": "VulnCheck Advisory: SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room", "tags": ["third-party-advisory"], "url": "https://www.vulncheck.com/advisories/sglang-through-0.5.19-unbounded-memory-allocation-via-bootstrap-room"}], "credits": [{"lang": "en", "value": "Jiapeng Li", "type": "finder"}, {"lang": "en", "value": "Mingkai Yu", "type": "finder"}, {"lang": "en", "value": "Jiajia Liu", "type": "finder"}], "x_generator": {"engine": "vulncheck-endgame"}}}}

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