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CVE-2025-57809

Mlc-ai Xgrammar denial of service

7.5 HIGHPublic exploitEPSS 0.47%
  1. Published25 Aug 2025

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.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

Mlc-ai Xgrammar< 0.1.21

Remediation

Fixed in
Mlc-ai Xgrammar≥ 0.1.21

References

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Frequently asked

Is CVE-2025-57809 being actively exploited?

CVE-2025-57809 is not in the CISA KEV catalog. A public exploit reference exists, so treat it as exploitable. Its EPSS exploit probability is 0.47%.

How severe is CVE-2025-57809?

CVE-2025-57809 has a CVSS 3.1 base score of 7.5, rated high. EPSS estimates a 0.47% probability of exploitation.

Which products are affected by CVE-2025-57809?

Affected products include Mlc-ai Xgrammar.

How do I fix CVE-2025-57809?

Upgrade affected software to a fixed version, for example Mlc-ai Xgrammar 0.1.21 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2025-57809 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.