High 7.5Published Sep 29, 2026

CVE-2026-102634SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room

Updated under an hour ago (Oct 28, 2026, 8:10 AM ET)

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It affects sgl-project sglang. Add what you run to find out whether that includes you.

EPSS puts the chance of exploitation in the next 30 days at 0.58%, higher than 46% of scored CVEs.

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Every CVE for sgl-project sglang

Exploited in the last 30 days

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.

CVSS: 7.5 HIGH (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): CWE-694
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): 0.58% (percentile 46)
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: Sep 29, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

sgl-project sglang sgl_project:sglang (from the name)	through 0.5.20	CNA record

References

References

https://github.com/sgl-project/sglang/issues/40125	issue-tracking
https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/conn.py#L392-L393	technical-description
https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/mooncake/conn.py#L2760-L2764	technical-description
https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/decode.py#L942	technical-description
https://github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/managers/io_struct.py#L281	technical-description
https://github.com/sgl-project/sglang	product
https://www.vulncheck.com/advisories/sglang-through-0.5.20-denial-of-service-via-duplicate-bootstrap-room	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.