CVE-2025-57809: XGrammar affected by Denial of Service by infinite recursion grammars

August 25, 2025 (updated August 26, 2025)

This issue: http://github.com/mlc-ai/xgrammar/issues/250 should have it’s own security advisory. Since several tools accept and pass user supplied grammars to xgrammar, and it is so easy to trigger it seems like a High.

References

github.com/advisories/GHSA-5cmr-4px5-23pc
github.com/mlc-ai/xgrammar
github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5
github.com/mlc-ai/xgrammar/issues/250
github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc
nvd.nist.gov/vuln/detail/CVE-2025-57809

Code Behaviors & Features

Detect and mitigate CVE-2025-57809 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Learn more about Dependency Scanning →