Denial of service in XGrammar



Risk Medium
Patch available YES
Number of vulnerabilities 1
CVE-ID CVE-2025-32381
CWE-ID CWE-400
Exploitation vector Network
Public exploit N/A
Vulnerable software
 XGrammar
Universal components / Libraries / Libraries used by multiple products

Vendor mlc-ai

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Resource exhaustion

EUVDB-ID: #VU118090

Risk: Medium

CVSSv4.0: 4.9 [CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2025-32381

CWE-ID: CWE-400 - Resource exhaustion

Exploit availability: No

Description

The vulnerability allows a remote user to perform a denial of service (DoS) attack.

The vulnerability exists due to application does not properly control consumption of internal resources when parsing unique JSON schemas. A remote user can trigger resource exhaustion and perform a denial of service (DoS) attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

XGrammar: 0.1.0 - 0.1.17

CPE2.3 External links

https://github.com/mlc-ai/xgrammar/pull/243
https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3
https://github.com/vllm-project/vllm/pull/16283


Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote authenticated user via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.



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