CVE-2025-32381

MEDIUM EPSS 32.7%
Published Apr 9, 20251y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Apr 9, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

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.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
32.7% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-770

Affected Products 1

VendorProductVersionRange
mlc-aixgrammar* <0.1.18

References 3

  • github.com https://github.com/mlc-ai/xgrammar/pull/243
    Issue TrackingPatch
  • github.com https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3
    Vendor Advisory
  • github.com https://github.com/vllm-project/vllm/pull/16283
    Issue TrackingPatch

Remediation

  • github.com https://github.com/mlc-ai/xgrammar/pull/243
    Issue TrackingPatch
  • github.com https://github.com/vllm-project/vllm/pull/16283
    Issue TrackingPatch