High
SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room
Type: advisorySources: OSV
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.
- Products
- Not specified
- Affected versions
- Not specified
- Fixed versions
- Not specified
- CVEs
- CVE-2026-93688
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 2 Nov 2026, 22:31 UTC · Revision 1
Source evidence
SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room
core-osv · Original sourcePublished 18 Sept 2026, 15:06 UTC
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.
osv:CVE-2026-93688
Complete source record
{
"id": "c45182f4629e1b25f987cc9dabaa42904272db25ff79a93e53f14e3d026a686a",
"url": "https://osv.dev/vulnerability/CVE-2026-93688",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room",
"summary": "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.",
"evidence": "osv:CVE-2026-93688",
"products": [],
"severity": "high",
"structured": {
"id": "CVE-2026-93688",
"aliases": [
"CVE-2026-93688"
],
"metrics": [
{
"type": "CVSS_V4",
"score": "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"
}
],
"affected": [
{
"ranges": [
{
"repo": "https://github.com/sgl-project/sglang",
"type": "GIT",
"events": [
{
"introduced": "0"
},
{
"last_affected": "0bcd822377da7b5718e674eaf9c870d349424dd1"
}
],
"database_specific": {
"extracted_events": [
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.5.19"
}
],
"source": "AFFECTED_FIELD",
"strategy": "StandardRange"
},
{
"range": [
{
"introduced": "0"
},
{
"last_affected": "0.5.19"
}
],
"source": "DESCRIPTION"
}
]
}
}
],
"versions": [
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"gateway-v0.3.1",
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"v0.5.6.post2",
"gateway-v0.2.4",
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"v0.4.9.post3",
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"gateway-v0.1.5",
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"v0.4.3",
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"v0.3.6",
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"v0.3.5",
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"v0.2.9",
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"v0.2.0",
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"v0.1.23",
"v0.1.22",
"v0.1.21",
"v0.1.20",
"v0.1.19",
"v0.1.18",
"v0.1.17",
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"v0.1.8",
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"v0.1.6",
"v0.1.5",
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],
"database_specific": {
"source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-93688.json"
}
}
],
"modified": "2026-10-28T02:30:24.134175197Z",
"provider": "osv",
"references": [
"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93688.json",
"https://nvd.nist.gov/vuln/detail/CVE-2026-93688",
"https://www.vulncheck.com/advisories/sglang-through-0.5.19-unbounded-memory-allocation-via-bootstrap-room",
"https://github.com/sgl-project/sglang/issues/39428",
"https://github.com/sgl-project/sglang",
"https://pypi.org/project/sglang",
"https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L1988-L1990",
"https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L2118-L2119",
"https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/io_struct.py#L281",
"https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/scheduler.py#L2672-L2690"
],
"provider_metadata": {
"cwe_ids": [
"CWE-770"
],
"cna_assigner": "VulnCheck",
"osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93688.json"
}
},
"related_cves": [
{
"value": "CVE-2026-93688",
"evidence": "/id"
}
],
"security_relevant": true,
"severity_evidence": "/severity/0/score"
},
"source_id": "core-osv",
"document_id": 490554,
"published_at": "2026-09-18T15:06:03.53+00:00"
}