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CVE-2025-32381 Detail

Description

XGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to 0.1.18, Xgrammar includes a cache for compiled grammars to increase performance with repeated use of the same grammar. This cache is held in memory. Since the cache is unbounded, a system making use of xgrammar can be abused to fill up a host's memory and case a denial of service. For example, sending many small requests to an LLM inference server with unique JSON schemas would eventually cause this denial of service to occur. This vulnerability is fixed in 0.1.18.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://github.com/mlc-ai/xgrammar/pull/243 GitHub, Inc. Issue Tracking  Patch 
https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3 GitHub, Inc. Vendor Advisory 
https://github.com/vllm-project/vllm/pull/16283 GitHub, Inc. Issue Tracking  Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-770 Allocation of Resources Without Limits or Throttling GitHub, Inc.  

Known Affected Software Configurations Switch to CPE 2.2

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Change History

2 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2025-32381
NVD Published Date:
04/09/2025
NVD Last Modified:
09/17/2025
Source:
GitHub, Inc.