FKIE_CVE-2025-32381

Vulnerability from fkie_nvd - Published: 2025-04-09 16:15 - Updated: 2025-09-17 18:14
Severity ?
6.5 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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.
References
security-advisories@github.comhttps://github.com/mlc-ai/xgrammar/pull/243Issue Tracking, Patch
security-advisories@github.comhttps://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3Vendor Advisory
security-advisories@github.comhttps://github.com/vllm-project/vllm/pull/16283Issue Tracking, Patch
Impacted products
Vendor Product Version
mlc-ai xgrammar *
To clipboard 

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      "value": "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\u0027s 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."
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      "value": "XGrammar es una librer\u00eda de c\u00f3digo abierto para la generaci\u00f3n estructurada eficiente, flexible y port\u00e1til. Antes de la versi\u00f3n 0.1.18, Xgrammar inclu\u00eda una cach\u00e9 para gram\u00e1ticas compiladas que mejoraba el rendimiento con el uso repetido de la misma gram\u00e1tica. Esta cach\u00e9 se almacena en memoria. Dado que la cach\u00e9 es ilimitada, un sistema que utiliza xgrammar puede ser utilizado de forma abusiva para saturar la memoria del host y provocar una denegaci\u00f3n de servicio. Por ejemplo, enviar muchas solicitudes peque\u00f1as a un servidor de inferencia LLM con esquemas JSON \u00fanicos podr\u00eda provocar esta denegaci\u00f3n de servicio. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 0.1.18."
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  "id": "CVE-2025-32381",
  "lastModified": "2025-09-17T18:14:55.287",
  "metrics": {
    "cvssMetricV31": [
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          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
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          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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