CVE-2025-57809
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductMlc-ai Xgrammar
PublishedAug 25, 2025
First seenAug 25, 2025
Weakness typeCWE-674CWE-674
How to fix
Update
- mlc-ai xgrammar0.1.21 or later
- xgrammar0.1.21 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mlc-ai xgrammar | v < 0.1.21 | 0.1.21 |
| xgrammarPyPI | v < 0.1.21 | 0.1.21 |
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