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    CVE-2026-109227

    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.

    Published:Oct 12, 2026
    Last Modified:Oct 18, 2026
    EPS:Oct 12, 2026
    EPSS Score:0.00422
    CVSS Score:7.5

    Affected Products

    Vendor
    Lmsys
    Product
    Sglang
    Vendor
    Sgl-project
    Product
    Sglang

    Exploits

    No exploit reference

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    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High