High 8.7Published Mar 5, 2026

CVE-2026-25048xgrammar: Multi-layer nesting causes DoS

Updated under an hour ago (Oct 27, 2026, 2:30 PM ET)

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It affects mlc-ai xgrammar and 4 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Every CVE for mlc-ai xgrammar

Exploited in the last 30 days

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: 8.7 HIGH (v4.0, CNA)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
Weakness (CWE): CWE-674
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: Jul 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

mlc-ai xgrammar mlc_ai:xgrammar (from the name)	before 0.1.32	CNA record
Red Hat Red Hat AI Inference Server 3.2 redhat:ai_inference_server	from 1774351144 not affected	CISA ADP
Red Hat Red Hat OpenShift AI 2.25 redhat:openshift_ai	from 1780069069 not affected	CISA ADP
Red Hat Red Hat Enterprise Linux AI (RHEL AI) 3 redhat:enterprise_linux_ai	3	CISA ADP
mlc-ai xgrammar mlc-ai:xgrammar	before 0.1.32	NVD

References

References

https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-7rgv-gqhr-fxg3	x-refsource-confirm, exploit, vendor-advisory
https://github.com/mlc-ai/xgrammar/releases/tag/v0.1.32	x-refsource-misc, release-notes
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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.