CVE-2025-57809
XGrammar affected by Denial of Service by infinite recursion grammars
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.
INFO
Published Date :
Aug. 25, 2025, 10:15 p.m.
Last Modified :
Sept. 9, 2025, 6:57 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update the XGrammar library to version 0.1.21.
- Use a fixed version of XGrammar for your application.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-57809.
| URL | Resource |
|---|---|
| https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5 | Patch |
| https://github.com/mlc-ai/xgrammar/issues/250 | Exploit Issue Tracking |
| https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-57809 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-57809
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-57809 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-57809 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Sep. 09, 2025
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Added CPE Configuration OR *cpe:2.3:a:mlc-ai:xgrammar:*:*:*:*:*:*:*:* versions up to (excluding) 0.1.21 Added Reference Type GitHub, Inc.: https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5 Types: Patch Added Reference Type GitHub, Inc.: https://github.com/mlc-ai/xgrammar/issues/250 Types: Exploit, Issue Tracking Added Reference Type GitHub, Inc.: https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc Types: Vendor Advisory -
New CVE Received by [email protected]
Aug. 25, 2025
Action Type Old Value New Value Added 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. Added CVSS V4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-674 Added Reference https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5 Added Reference https://github.com/mlc-ai/xgrammar/issues/250 Added Reference https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc