What’s Vulnerable › Vulnerabilities

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

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-05 · updated 2026-07-21
• Weakness: CWE-674

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.

Affected products

• mlc-ai xgrammar: before 0.1.32 — fixed in 0.1.32

How to fix

Upgrade to a fixed version: mlc-ai xgrammar 0.1.32. Check the vendor advisory for mitigations.

References

• https://github.com/mlc-ai/xgrammar/releases/tag/v0.1.32
• https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-7rgv-gqhr-fxg3
• 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

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