CVE-2025-32381

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.

Reserved 2025-04-06 | Published 2025-04-09 | Updated 2025-04-09 | Assigner GitHub_M

Problem types

CWE-770: Allocation of Resources Without Limits or Throttling

Product status

< 0.1.18
affected

References

github.com/...rammar/security/advisories/GHSA-389x-67px-mjg3

github.com/mlc-ai/xgrammar/pull/243

github.com/vllm-project/vllm/pull/16283

cve.org (CVE-2025-32381)

nvd.nist.gov (CVE-2025-32381)

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