CVE-2026-25048
xgrammar is an open-source library for efficient, flexible, and portable structured generation.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.20%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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
- 8.7 HIGHCVSS: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/M
- EPSS
- 1.20% probability · 68th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-674
- Affected
- mlc-ai/xgrammar
- Source
- security-advisories@github.com
EPSS 1.2% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://github.com/mlc-ai/xgrammar/releases/tag/v0.1.32Release Notes
- https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-7rgv-gqhr-fxg3Exploit, Vendor 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
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.