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CVE-2025-58446

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Date: September 6, 2025

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.

Severity Score

Related Resources (5)

https://github.com/mlc-ai/xgrammar
https://github.com/mlc-ai/xgrammar/commit/ced69c3ad2f8f61b516cc278a342e7c644383e27
https://nvd.nist.gov/vuln/detail/CVE-2025-58446
https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-9q5r-wfvf-rr7f
https://www.mend.io/vulnerability-database/CVE-2025-58446

Severity Score

Weakness Type (CWE)

Allocation of Resources Without Limits or Throttling

CWE-770

Top Fix

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Upgrade Version

Upgrade to version xgrammar - 0.1.24

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): NONE
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): LOW
Integrity (I): LOW
Availability (A): HIGH

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