CVE-2025-57809

XGrammar affected by Denial of Service by infinite recursion grammars

State: Published
Severity: 7.7 High
Published: Aug 25, 2025
Updated: Aug 26, 2025
Reserved: Aug 20, 2025

Description

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.

Scores

CVSS	Score	Vector	Source
4.0	7.7 High	CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P	GitHub_M

Weaknesses

CWE-674 Uncontrolled Recursion

Affected Products

Product	Versions
xgrammarmlc-ai	< 0.1.21Affected

References

https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc
https://github.com/mlc-ai/xgrammar/issues/250
https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5

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