{"schema_version":"1","data":[{"id":1711,"advisory_id":"9256664d-7138-4140-8635-2b309e4ef55b","revision":1,"source_id":"core-cve","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-93838","source_published_at":"2026-09-18T19:06:03.899+00:00","published_at":"2026-10-24T21:06:12.191896+00:00","extraction_method":"structured","technologies":["core-cve","sglang"],"cve_ids":["CVE-2026-93838"],"event_types":["advisory"],"payload":{"kind":"advisory","title":"SGLang through 0.5.20 Unbounded Memory Allocation via STAGING_REQ chunk_idx","summary":"SGLang versions through 0.5.20 contain an unbounded memory allocation vulnerability in handle_staging_req() that fails to validate chunk_idx from ZMQ STAGING_REQ frames in prefill/decode disaggregation deployments. Attackers with access to the decode engine's internal ZMQ rank port can send a frame with an extremely large chunk_idx value, causing the scheduler to allocate memory until the system runs out and terminates the process.","evidence":"cve:CVE-2026-93838","products":[{"name":{"value":"sglang","evidence":"/containers/cna/affected/0/product"},"prerequisites":[],"fixed_versions":[],"affected_versions":[]}],"severity":"high","structured":{"id":"CVE-2026-93838","aliases":["CVE-2026-93838"],"metrics":[{"format":"CVSS","cvssV4_0":{"version":"4.0","baseScore":8.2,"attackVector":"NETWORK","baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","userInteraction":"NONE","attackComplexity":"LOW","attackRequirements":"PRESENT","privilegesRequired":"NONE","subIntegrityImpact":"NONE","vulnIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","vulnConfidentialityImpact":"NONE"}},{"format":"CVSS","cvssV3_1":{"scope":"UNCHANGED","version":"3.1","baseScore":5.9,"attackVector":"NETWORK","baseSeverity":"MEDIUM","vectorString":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H","integrityImpact":"NONE","userInteraction":"NONE","attackComplexity":"HIGH","availabilityImpact":"HIGH","privilegesRequired":"NONE","confidentialityImpact":"NONE"}}],"affected":[{"repo":"https://github.com/sgl-project/sglang","vendor":"sgl-project","product":"sglang","versions":[{"status":"affected","version":"0","versionType":"semver","lessThanOrEqual":"0.5.20"}],"packageURL":"pkg:pypi/sglang","collectionURL":"https://pypi.org/project/sglang","defaultStatus":"unaffected"}],"modified":"2026-09-24T14:23:13.073Z","provider":"cve","references":["https://github.com/sgl-project/sglang/issues/39764","https://github.com/sgl-project/sglang","https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/staging_handler.py#L781","https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/staging_handler.py#L848-L860","https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/conn.py#L1636-L1640","https://www.vulncheck.com/advisories/sglang-through-0.5.20-unbounded-memory-allocation-via-staging-req-chunk-idx"],"provider_metadata":{"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-93838","role":"CISA Coordinator","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-09-18T20:09:38.130553Z"}}}],"references":[{"url":"https://github.com/sgl-project/sglang/issues/39764","tags":["exploit"]}],"providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-09-18T20:09:44.508Z"}}],"cna":{"orgId":"83251b91-4cc7-4094-a5c7-464a1b83ea10","shortName":"VulnCheck","dateUpdated":"2026-09-24T14:23:13.073Z"}}},"related_cves":[{"value":"CVE-2026-93838","evidence":"/cveMetadata/cveId"}],"security_relevant":true,"severity_evidence":"/containers/cna/metrics"}}],"next_after":1711,"next_before":1711}