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.
How to fix
- mlc-ai xgrammar0.1.18 or later
- xgrammar0.1.18 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mlc-ai xgrammar | v < 0.1.18 | 0.1.18 |
| xgrammarPyPI | v < 0.1.18 | 0.1.18 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.