Vulnerability in Sgl-Project Sglang
CVE-2026-102634
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
EPSS exploit prediction
No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.
Affected products
Weakness classification (CWE)
References
- github.com/sgl-project/sglang/issues/40125 (issue-tracking)
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/com… (technical-description)
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/moo… (technical-description)
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/disaggregation/dec… (technical-description)
- github.com/sgl-project/sglang/blob/v0.5.20/python/sglang/srt/managers/io_struct… (technical-description)
- github.com/sgl-project/sglang (product)
- www.vulncheck.com/advisories/sglang-through-0.5.20-denial-of-service-via-duplic… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-102634?
- CVE-2026-102634 is a high-severity vulnerability in Sgl-Project Sglang, classified under Use of Multiple Resources with Duplicate Identifier. CVSS score: 7.5/10. Published 2026-09-29.
- How severe is CVE-2026-102634?
- High severity. CVSS v3 base score is 7.5 out of 10.