How severe is CVE-2026-25048?

CVE-2026-25048 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-25048 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-25048?

CVE-2026-25048 affects Mlc-ai Xgrammar. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-25048?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-25048 have an EU (EUVD) identifier?

Yes. CVE-2026-25048 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9830.

When was CVE-2026-25048 published?

CVE-2026-25048 was published on 2026-03-05 and last updated on 2026-06-30.

CVE-2026-25048

CVE-2026-25048 is a high-severity vulnerability in Mlc-ai Xgrammar with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-674.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 8.7
EPSS exploit prediction: 1% (48th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-9830
Weakness: CWE-674
Affected product: Mlc-ai Xgrammar
Published: 2026-03-05
Last modified: 2026-06-30

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.

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.
How severe is CVE-2026-25048?: CVE-2026-25048 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-25048 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (48th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-25048?: CVE-2026-25048 affects Mlc-ai Xgrammar. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-25048?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-25048 have an EU (EUVD) identifier?: Yes. CVE-2026-25048 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-9830.
When was CVE-2026-25048 published?: CVE-2026-25048 was published on 2026-03-05 and last updated on 2026-06-30.

References

Affected products (1)

cpe:2.3:a:mlc-ai:xgrammar:*:*:*:*:*:*:*:*

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