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CVE-2026-112270— SGLang through 0.5.22 Memory Exhaustion via Mooncake STAGING_RSP chunk_idx

Quick assessment

Affected
sgl-project sglang
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

SGLang 0.5.22 及更早版本在使用 Mooncake 解耦后端时，其 函数中存在一个不受控的内存分配漏洞。该漏洞允许未认证的邻近网络攻击者耗尽 Prefill 内存。攻击者可通过 接口获取 rank 地址，并针对新的 room ID 发送包含巨大 值的 消息，导致调度器因内存不足（OOM）而被系统终止。

CVSS 6.5 · Medium

Possible ATT&CK Techniques 1 AI

T1499.003 · Application Exhaustion Flood
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I. Basic Information for CVE-2026-112270

Vulnerability Information
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Vulnerability Title
SGLang through 0.5.22 Memory Exhaustion via Mooncake STAGING_RSP chunk_idx
Source: CVE Program / CVE List V5
Vulnerability Description
SGLang through 0.5.22 with the Mooncake disaggregation backend contains an uncontrolled memory allocation vulnerability in handle_staging_rsp() that lets unauthenticated network-adjacent attackers exhaust Prefill memory. Attackers can obtain the rank address from the /route endpoint and send STAGING_RSP messages with huge chunk_idx values under fresh room IDs, causing the scheduler to be OOM-killed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
不加限制或调节的资源分配
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
sgl-project sglang 0 ~ 0.5.22 -

II. Public POCs for CVE-2026-112270

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III. Intelligence Information for CVE-2026-112270

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Other References for CVE-2026-112270 (4)

Same Patch Batch · sgl-project · 2026-10-19 · 7 CVEs total

CVE-2026-112082 7.5 HIGH sgl-project SGLang Expert-Distribution Recording Endpoint expert_distribution.py Scheduler
CVE-2026-112267 6.5 MEDIUM SGLang through 0.5.22 SSRF via bootstrap_host and bootstrap_port on Decode Worker
CVE-2026-112269 6.5 MEDIUM SGLang through 0.5.22 Memory Exhaustion via Unauthenticated Mooncake Decode Registrations
CVE-2026-112268 6.3 MEDIUM sglang-router through 0.3.2 Authorization Bypass via Mesh HA Management Routes
CVE-2026-112266 5.9 MEDIUM SGLang through 0.5.22 Cross-Request Abort via rid Prefix Matching
CVE-2026-112083 5.3 MEDIUM sgl-project SGLang Weight Exporter weight_exporter.py WeightExporter.send_weights_to_remot

IV. Related Vulnerabilities

Same product: sglang
Same vendor: sgl-project
Same weakness: CWE-770

V. Comments for CVE-2026-112270

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