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Vulnerability record · CVE-2026-25048 · published 5 March 2026

CVE-2026-25048: Mlc-ai xgrammar vulnerability

MMlc Ai · Xgrammar

xgrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.32, the multi-level nested syntax caused a segmentation fault (core dumped). This issue has been patched in version 0.1.32.

8.7 CVSS 4.0 High EPSS 0.71% · top 48.5% CWE-674 · CWE-674
8.7CVSS 4.0 base score
0.71%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
10References, 1 tagged exploit
21 Jul 2026Last modified by NVD

Description

xgrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.32, the multi-level nested syntax caused a segmentation fault (core dumped). This issue has been patched in version 0.1.32.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/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:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/mlc-ai/xgrammar/releases/tag/v0.1.32 Release Notes
https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-7rgv-gqhr-fxg3 ExploitVendor Advisory
https://access.redhat.com/errata/RHSA-2026:24977
https://access.redhat.com/errata/RHSA-2026:42644
https://access.redhat.com/errata/RHSA-2026:5809
https://access.redhat.com/errata/RHSA-2026:6761
https://access.redhat.com/errata/RHSA-2026:6762
https://access.redhat.com/security/cve/CVE-2026-25048
https://bugzilla.redhat.com/show_bug.cgi?id=2444840
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25048.json

Track CVE-2026-25048 inside VULONE

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

7.7CVE-2025-57809Mlc-ai xgrammar vulnerabilityXGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to version 0.1.21, XGrammar has an infinite rec…EPSS 0.47%6.9CVE-2025-58446Mlc-ai xgrammar allocation without limits vulnerabilityxgrammar is an open-source library for efficient, flexible, and portable structured generation. A grammar optimizer introduced in 0.1.23 processes la…EPSS 0.53%6.5CVE-2025-32381Mlc-ai xgrammar allocation without limits vulnerabilityXGrammar is an open-source library for efficient, flexible, and portable structured generation. Prior to 0.1.18, Xgrammar includes a cache for compil…EPSS 0.50%

Source: NIST National Vulnerability Database (record CVE-2026-25048), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.