CVE-2025-32381
Last modified
CVE-2025-32381 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.41% chance of exploitation in the next 30 days.
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
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mlc-Ai | Xgrammar | < 0.1.18 |
References
- https://github.com/mlc-ai/xgrammar/pull/243Issue Tracking, Patch
- https://github.com/vllm-project/vllm/pull/16283Issue Tracking, Patch
Timeline
- Published
- Last Modified
- Status
- Analyzed
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