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Vulnerabilities

Vulnerability · CVE-2025-57809

XGrammar is an open-source library for efficient, flexible, and portable structured generation.

Published Aug 25, 2025 · catalog updated Aug 26, 2025 · XGrammar is an open-source

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2025-57809. EPSS is 0.48%. Act only if a listed version of XGrammar is an open-source is installed.

Gaps on this record

  • The stored product name is a package slug. The name on this page is taken from the title (XGrammar is an open-source).
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.7
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.48%
Remediation
Version ranges on file
Affected products
vendor mlc-ai xgrammar < 0.1.21

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor mlc-ai xgrammar < 0.1.21< 0.1.21

How to fix CVE-2025-57809

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-57809. EPSS is 0.48%. Act only if a listed version of XGrammar is an open-source is installed.

Which versions are affected?

Compare what you have installed with mlc-ai xgrammar < 0.1.21 < 0.1.21. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.48%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Aug 25, 2025 · EUVD

    Detected

    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.

  2. Aug 26, 2025 · EUVD

    Updated

    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.

Sources

  • CVE.orgVulnerability recordCVE-2025-57809

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-57809

    30-day exploitation probability 0.48%

    first.org
  • EUVDVulnerability recordEUVD-2025-28633

    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.

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • FIRST EPSSOct 25, 2026
  • CVE.orgOct 22, 2026
  • EUVDOct 22, 2026