CVE-2025-57809

CVE-2025-57809 affects XGrammar. Prior to 0.1.21, there is an infinite recursion issue in the grammar; this is resolved in version 0.1.21. CVSSv3.1 base score 7.5 (HIGH) with availability impact; CVSS4 base score 8.7 (HIGH) with high availability impact. Remediation: upgrade XGrammar to 0.1.21 or...

CVE-2025-57809 XGrammar affected by Denial of Service by infinite recursion grammars

XGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.21, XGrammar has an infinite recursion issue in the grammar. This issue has been resolved in version 0.1.21...

CVE-2025-57809 XGrammar affected by Denial of Service by infinite recursion grammars

XGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.21, XGrammar has an infinite recursion issue in the grammar. This issue has been resolved in version 0.1.21...

XGrammar affected by Denial of Service by infinite recursion grammars

Summary This issue: http://github.com/mlc-ai/xgrammar/issues/250 should have it's own security advisory. Since several tools accept and pass user supplied grammars to xgrammar, and it is so easy to trigger it seems like a High...

GHSA-5CMR-4PX5-23PC XGrammar affected by Denial of Service by infinite recursion grammars

Summary This issue: http://github.com/mlc-ai/xgrammar/issues/250 should have it's own security advisory. Since several tools accept and pass user supplied grammars to xgrammar, and it is so easy to trigger it seems like a High...

CVE-2025-57809: Uncontrolled Recursion

XGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.21, XGrammar has an infinite recursion issue in the grammar. This issue has been resolved in version 0.1.21...

PT-2025-34711

Name of the Vulnerable Software and Affected Versions: XGrammar versions prior to 0.1.21 Description: XGrammar, an open-source library for structured generation, contains an infinite recursion issue within its grammar. This issue was addressed in version 0.1.21. Recommendations: Update to version...

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 0.1.21, which stems from an infinite recursion problem in the syntax...

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 guidedregex parameter when using xgrammar validation. An attacker can cause the application to crash by sending an...

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...