SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.
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Fixes

Solution

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Workaround

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History

Tue, 29 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description SGLang through 0.5.20 in prefill/decode disaggregation mode fails to validate duplicate bootstrap_room fields in /generate requests with Mooncake KV transfer backend. Unauthenticated attackers can send concurrent requests with identical bootstrap_room values to crash scheduler processes or hang other users' requests until transfer timeout.
Title SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room
First Time appeared Lmsys
Lmsys sglang
Weaknesses CWE-694
CPEs cpe:2.3:a:lmsys:sglang:*:*:*:*:*:*:*:*
Vendors & Products Lmsys
Lmsys sglang
References
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

cvssV4_0

{'score': 8.7, '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'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: VulnCheck

Published:

Updated: 2026-09-29T17:33:09.537Z

Reserved: 2026-09-29T15:50:38.222Z

Link: CVE-2026-102634

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-29T17:17:07.147

Modified: 2026-09-29T17:17:07.280

Link: CVE-2026-102634

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses