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    CVE-2025-58446

    xgrammar is an open-source library for efficient, flexible, and portable structured generation. A grammar optimizer introduced in 0.1.23 processes large grammars (>100k characters) at very low rates, and can be used for DOS of model providers. This issue is fixed in version 0.1.24.

    Published:Sep 6, 2025
    Last Modified:Sep 18, 2025
    EPS:Sep 6, 2025
    EPSS Score:0.00055
    CVSS Score:7.5

    Affected Products

    Vendor
    Mlc-ai
    Product
    Xgrammar

    Exploits

    https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-9q5r-wfvf-rr7f

    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