CVE-2026-102634
SGLang through 0.5.20 Denial of Service via Duplicate bootstrap_room
sgl-project sglang
CVSS
8.7HighExploitationPublic exploit codeCISA's assessment says proof of concept code is public, assessed 29 Sep 2026. Not in the KEV catalogCISA via CVE List
Exploit odds (EPSS)0.58%Chance of exploitation activity in the next 30 days, higher than 47% of CVEs. Scored 23 Oct 2026FIRST EPSS
Fixed inNone listedNo source names a fixed version. Check the vendor advisory below
What fixes it
No source in this snapshot names a fixed version. The vendor advisories under References are the place to check.
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.
Text from CVE List
Affected versions 1
- sglangaffected: all versions through 0.5.20CVE List
References 7
- vulncheck.com/advisories/sglang-through-0.5.20-denial-of-service-via-duplicate-bootstrap-roomAdvisoryvia CVE List
- github.com/sgl-project/sglang/issues/40125Exploitvia CVE List
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/common/conn.py#L392-L393Referencevia CVE List
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/mooncake/conn.py#L2760-L2764Referencevia CVE List
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/decode.py#L942Referencevia CVE List
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/managers/io_struct.py#L281Referencevia CVE List
- github.com/sgl-project/sglangReferencevia CVE List