CVE-2025-58446 — HIGH (7.5)

Vulnerability Description

xgrammar is an open-source library for efficient, flexible, and portable structured generation. A grammar optimizer introduced in 0.1.23 processes large grammars (>100k characters) at very low rates, and can be used for DOS of model providers. This issue is fixed in version 0.1.24.

CVSS Score

7.5

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality

NONE

Integrity

NONE

Availability

HIGH

Affected Products

Vendor	Product	Versions
Mlc-Ai	Xgrammar	0.1.23

Related Weaknesses (CWE)

CWE-770

References

https://github.com/mlc-ai/xgrammar/commit/ced69c3ad2f8f61b516cc278a342e7c644383ePatch
https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-9q5r-wfvf-rr7fExploitVendor Advisory

FAQ

What is CVE-2025-58446?

CVE-2025-58446 is a vulnerability with a CVSS score of 7.5 (HIGH). xgrammar is an open-source library for efficient, flexible, and portable structured generation. A grammar optimizer introduced in 0.1.23 processes large grammars (>100k characters) at very low rates, ...

How severe is CVE-2025-58446?

CVE-2025-58446 has been rated HIGH with a CVSS base score of 7.5/10. Review the CVSS metrics above for detailed severity breakdown.

Is there a patch for CVE-2025-58446?

Check the references section above for vendor advisories and patch information. Affected products include: Mlc-Ai Xgrammar.