Uncaught Exception

Overview vllm is an A high-throughput and memory-efficient inference and serving engine for LLMs Affected versions of this package are vulnerable to Uncaught Exception through the guidedjson parameter when using xgrammar validation. An attacker can cause the application to crash by sending an...

Denial Of Service (DoS)

XGrammar is vulnerable to Denial Of Service DoS. The vulnerability is due to unbounded in-memory caching of compiled grammars, allows an attacker to exhaust system memory due to unbounded in-memory caching of compiled grammars...

Allocation of Resources Without Limits or Throttling

Overview xgrammar is an Efficient, Flexible and Portable Structured Generation Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling in threadsafecache.h, which can be populated by an indefinitely large number of entries corresponding to each new...

vLLM vulnerable to Denial of Service by abusing xgrammar cache

Impact This report is to highlight a vulnerability in XGrammar, a library used by the structured output feature in vLLM. The XGrammar advisory is here: https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3 The xgrammar library is the default backend used by vLLM to support...

GHSA-HF3C-WXG2-49Q9 vLLM vulnerable to Denial of Service by abusing xgrammar cache

Impact This report is to highlight a vulnerability in XGrammar, a library used by the structured output feature in vLLM. The XGrammar advisory is here: https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3 The xgrammar library is the default backend used by vLLM to support...

CVE-2025-32381

A flaw was found in Xgrammar. This vulnerability allows a denial of service DoS via unbounded memory usage when handling a large number of unique grammar inputs from untrusted sources. Mitigation Mitigation for this issue is either not available or the currently available options do not meet the...

PYSEC-2025-235

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...

PYSEC-2025-235

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...

CVE-2025-32381

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...

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...

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...

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...

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...

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 · Xgrammar · Xgrammar

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...