mlc-ai xgrammar up to 0.1.31 recursion

Summaryinfo

A vulnerability, which was classified as problematic, was found in mlc-ai xgrammar up to 0.1.31. This impacts an unknown function. Executing a manipulation can lead to recursion. The identification of this vulnerability is CVE-2026-25048. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in mlc-ai xgrammar up to 0.1.31 and classified as problematic. This vulnerability affects some unknown functionality. The manipulation with an unknown input leads to a recursion vulnerability. The CWE definition for the vulnerability is CWE-674. The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability was named CVE-2026-25048 since 01/28/2026. The exploitation appears to be easy. The attack can be initiated remotely. No form of authentication is required for a successful exploitation. There are neither technical details nor an exploit publicly available. The MITRE ATT&CK project declares the attack technique as T1499.

Upgrading to version 0.1.32 eliminates this vulnerability. The upgrade is hosted for download at github.com.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Type

• Artificial Intelligence Software

Vendor

• mlc-ai

Name

• xgrammar

Version

• 0.1.0
• 0.1.1
• 0.1.2
• 0.1.3
• 0.1.4
• 0.1.5
• 0.1.6
• 0.1.7
• 0.1.8
• 0.1.9
• 0.1.10
• 0.1.11
• 0.1.12
• 0.1.13
• 0.1.14
• 0.1.15
• 0.1.16
• 0.1.17
• 0.1.18
• 0.1.19
• 0.1.20
• 0.1.21
• 0.1.22
• 0.1.23
• 0.1.24
• 0.1.25
• 0.1.26
• 0.1.27
• 0.1.28
• 0.1.29
• 0.1.30
• 0.1.31

Website

• Product: https://github.com/mlc-ai/xgrammar/

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