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CVE-2026-109227— SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing

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 版本 0.5.21 及之前版本中， 文件中的 函数存在一个无界内存分配漏洞。该漏洞在应用 限制之前，会以原始分辨率解码视频帧。远程攻击者可以向 Qwen-VL 部署服务的 接口提交高分辨率视频，并发请求会耗尽工作进程的内存，从而导致拒绝服务（DoS）。

CVSS 7.5 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
sgl-project sglang ≤ 0.5.21 affected
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I. Basic Information for CVE-2026-109227

Vulnerability Information
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Vulnerability Title
SGLang through 0.5.21 Memory Exhaustion DoS via Qwen-VL Video Preprocessing
Source: CVE Program / CVE List V5
Vulnerability Description
SGLang through 0.5.21 contains an unbounded memory allocation vulnerability in preprocess_video in qwen_vl.py that decodes frames at full source resolution before applying max_pixels limits. Remote attackers can submit high-resolution videos to /v1/chat/completions on Qwen-VL deployments, and concurrent requests exhaust worker memory causing denial of service.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/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 ~ 0.5.21 -

II. Public POCs for CVE-2026-109227

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III. Intelligence Information for CVE-2026-109227

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Vendor Advisories for CVE-2026-109227 (1)

Other References for CVE-2026-109227 (2)

Same Patch Batch · sgl-project · 2026-10-12 · 5 CVEs total

CVE-2026-109225 7.5 HIGH SGLang through 0.5.21 Memory Exhaustion DoS via /v1/audio/transcriptions Upload
CVE-2026-109226 7.5 HIGH SGLang through 0.5.21 Audio Decompression Amplification via load_audio
CVE-2026-109228 7.5 HIGH SGLang through 0.5.21 Resource Budget Bypass via GLM-V Video Parameters
CVE-2026-109229 7.5 HIGH SGLang through 0.5.21 Decompression Bomb DoS via NanoNemotronVLImageProcessor

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-109227

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