CVE-2026-93688Public exploitNetwork attack vector

Prefill process crash via orphan transfer state

Published Sep 18, 2026 · Updated Sep 18, 2026

Uncontrolled resource allocation in SGLang 0.5.19 and earlier allows remote attackers to crash prefill processes via POST /generate. The Mooncake prefill bootstrap thread accepts arbitrary bootstrap_room values and creates transfer_infos entries that no cleanup path removes when no KV chunk arrives. A reachable decode endpoint in prefill/decode disaggregation mode is required; repeated unique values exhaust memory until the kernel terminates the prefill process.

CVSS severity8.7
High
EPSS probability0.72%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Uncontrolled resource allocation in SGLang 0.5.19 and earlier allows remote attackers to crash prefill processes via POST /generate. The Mooncake prefill bootstrap thread accepts arbitrary bootstrap_room values and creates transfer_infos entries that no cleanup path removes when no KV chunk arrives. A reachable decode endpoint in prefill/decode disaggregation mode is required; repeated unique values exhaust memory until the kernel terminates the prefill process.

The record

CVE
CVE-2026-93688
Published
Sep 18, 2026
Updated
Sep 18, 2026
Vendor
SGLang Project
Product
SGLang
Classifications
CWE-770, T1499.003
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 18, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=0.5.19

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

SGLang Project · SGLangversion=0 <=0.5.19

Published CVSS scores

8.7VulnCheckCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-770Allocation of Resources Without Limits or Throttling
T1499.003Endpoint Denial of Service: Application Exhaustion Flood

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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