CVE-2026-93688CWE-770denial-of-service

CVE-2026-93688

High · published September 18, 2026

CVSS v3.1
7.5
EPSS
1%
Percentile
53.4
In the wild
Unconfirmed
What it is

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.

The record
Technical detail
CVSS v3.1
7.5 · HIGH
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS v4.0
8.7 · CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
EPSS
0.00720 · 53.4th percentile
Weakness
CWE-770 · Allocation of Resources Without Limits or Throttling
Published
2026-09-18T20:17Z
References (7)
https://github.com/sgl-project/sglang · [email protected]https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L1988-L1990 · [email protected]https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/disaggregation/mooncake/conn.py#L2118-L2119 · [email protected]https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/io_struct.py#L281 · [email protected]https://github.com/sgl-project/sglang/blob/v0.5.19/python/sglang/srt/managers/scheduler.py#L2672-L2690 · [email protected]https://github.com/sgl-project/sglang/issues/39428 · [email protected]https://www.vulncheck.com/advisories/sglang-through-0.5.19-unbounded-memory-allocation-via-bootstrap-room · [email protected]
EPSS history
Timeline
  • 20 SEP 03:25Z
    EPSS moved — → 0%
    epss
  • 18 SEP 15:06Z
    SGLang through 0.5.19 Unbounded Memory Allocation via bootstrap_room
    cvelistv5