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    CVE-2026-93838

    SGLang versions through 0.5.20 contain an unbounded memory allocation vulnerability in handle_staging_req() that fails to validate chunk_idx from ZMQ STAGING_REQ frames in prefill/decode disaggregation deployments. Attackers with access to the decode engine's internal ZMQ rank port can send a frame with an extremely large chunk_idx value, causing the scheduler to allocate memory until the system runs out and terminates the process.

    Published:Sep 18, 2026
    Last Modified:Sep 20, 2026
    EPS:Sep 18, 2026
    EPSS Score:0.00456
    CVSS Score:5.9

    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