CVE-2025-32381

XGrammar (open-source library for structured generation) has a DoS in-memory cache vulnerability. Before version 0.1.18, an unbounded in-memory cache of compiled grammars can be filled by many unique inputs (e.g., numerous JSON schemas), exhausting host memory and causing denial of service. The i...

CVE-2025-32381 Denial of Service by abusing xgrammar unbounded cache in memory

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 maki...

xgrammar Vulnerable to Denial of Service (DoS) by abusing unbounded cache in memory

Summary 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,...

GHSA-389X-67PX-MJG3 xgrammar Vulnerable to Denial of Service (DoS) by abusing unbounded cache in memory

Summary 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,...

PT-2025-15757

Name of the Vulnerable Software and Affected Versions: XGrammar versions prior to 0.1.18 Description: The issue concerns an unbounded cache for compiled grammars in memory, which can be exploited to cause a denial of service by filling up a host's memory. This can occur when a system using XGramm...

XGrammar 安全漏洞

XGrammar is a fast, flexible and portable structured generation tool from mlc-ai open source. A security vulnerability exists in XGrammar versions prior to 0.1.18, which stems from unrestricted caching that could lead to a denial of service...

CVE-2025-32381: Allocation of Resources Without Limits or Throttling

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 maki...