Vulnerability Description
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.
CVSS Score
HIGH
Related Weaknesses (CWE)
References
- https://github.com/sgl-project/sglang
- https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregat
- https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregat
- https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/io
- https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/sc
- https://github.com/sgl-project/sglang/issues/39428
- https://www.vulncheck.com/advisories/sglang-through-0.5.19-unbounded-memory-allo
FAQ
What is CVE-2026-93688?
CVE-2026-93688 is a vulnerability with a CVSS score of 7.5 (HIGH). 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 att...
How severe is CVE-2026-93688?
CVE-2026-93688 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-93688?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.