CVE-2026-25048
xgrammar: Multi-layer nesting causes DoS
CVSS v3
7.5
HIGH
EPSS Score
1.2 %
exploit probability, as of 2026-10-12
CISA KEV
No
known exploited
Exploitation
none
SSVC status
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Affected and fixed versions
Packages from OSV.dev and products from the vendors' CSAF advisories.
version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.
Packages
- xgrammarPyPIall versions · fixed in 0.1.32
Vendor advisories
xgrammar: xgrammar: Denial of Service via multi-level nested syntax
rhaiis/vllm-tpu-rhel9 as a component of Red Hat AI Inference Server · rhelai3/bootc-aws-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3 · rhelai3/bootc-azure-cuda-rhel9 as a component of Red Hat Enterprise Linux AI (RHEL AI) 3
Red Hat Security Advisory: RHOAI 2.25.9 - Red Hat OpenShift AI
Red Hat Security Advisory: RHOAI 2.25.7 - Red Hat OpenShift AI
Red Hat Security Advisory: Red Hat AI Inference Server 3.2.2 (ROCm)
Red Hat Security Advisory: Red Hat AI Inference Server Model Optimization Tools 3.2.2 (CUDA)
Red Hat Security Advisory: Red Hat AI Inference Server 3.2.2 (cuda-ubi9)
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.
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Published
- 2026-03-05
- Last Modified
- 2026-03-13
Frequently asked questions
What is CVE-2026-25048?
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.
Is CVE-2026-25048 actively exploited?
Active exploitation of CVE-2026-25048 has not been confirmed. Its EPSS score was 1.2% on 2026-10-12, the estimated probability of exploitation in the next 30 days.
What is the CVSS score for CVE-2026-25048?
CVE-2026-25048 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
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