CVE-2026-25048 PUBLISHED

xgrammar: Multi-layer nesting causes DoS

Assigner: GitHub_M
Reserved: 28.01.2026 Published: 05.03.2026 Updated: 05.03.2026

xgrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.32, the multi-level nested syntax caused a segmentation fault (core dumped). This issue has been patched in version 0.1.32.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	mlc-ai
Product	xgrammar
Versions	Version < 0.1.32 is affected

References

https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-7rgv-gqhr-fxg3
https://github.com/mlc-ai/xgrammar/releases/tag/v0.1.32

Problem Types

CWE-674: Uncontrolled Recursion CWE