Resource exhaustion in Sgl-Project Sglang
CVE-2026-93688
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.
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
EPSS: 0.007 (53.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 54th percentile — 53.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/sgl-project/sglang/issues/39428 (issue-tracking)
- github.com/sgl-project/sglang (product)
- github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/moo… (technical-description)
- github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/moo… (technical-description)
- github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/io_struct… (technical-description)
- github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/scheduler… (technical-description)
- www.vulncheck.com/advisories/sglang-through-0.5.19-unbounded-memory-allocation-… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-93688?
- CVE-2026-93688 is a high-severity vulnerability in Sgl-Project Sglang, classified under Allocation of Resources Without Limits or Throttling. CVSS score: 7.5/10. Published 2026-09-18.
- How severe is CVE-2026-93688?
- High severity. CVSS v3 base score is 7.5 out of 10.