CVE-2026-93688
SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-770 |
| Vendor | sgl-project |
| Product | sglang |
| Published | Sep 18, 2026 |
| Last Updated | Sep 18, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected Versions
sgl-project / sglang
0 ≤ 0.5.19
References
github.com: https://github.com/sgl-project/sglang/issues/39428 github.com: https://github.com/sgl-project/sglang github.com: https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L2118-L2119 github.com: https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L1988-L1990 github.com: https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/io_struct.py#L281 github.com: https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/scheduler.py#L2672-L2690 vulncheck.com: https://www.vulncheck.com/advisories/sglang-through-0.5.19-unbounded-memory-allocation-via-bootstrap-room
Credits
Jiapeng Li Mingkai Yu Jiajia Liu