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CVE-2025-32381

19
FAUCET Score

CVE-2025-32381 is a denial-of-service vulnerability affecting the XGrammar library (mlc_ai xgrammar) prior to version 0.1.18. The flaw stems from an unbounded in-memory cache for compiled grammars, allowing an attacker to exhaust system memory by repeatedly submitting unique grammar requests. This vulnerability has a CVSS score of 6.5 (Medium) due to its network-based attack vector, low complexity, and high impact on availability. Currently, there is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
< 0.1.18CPE matchmatch criteria
cpe:2.3:a:mlc-ai:xgrammar:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.5MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.47%
Probability of exploitation in next 30 days
EPSS Percentile
37.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0047 is in the 48th percentile among its peer group of 21,974 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (3)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: xgrammarFixed in: 0.1.18
redhatvendor investigatingvia redhat_api
Product: Red Hat Enterprise Linux AI (RHEL AI)Fixed in: rhelai1/ui-rhel9

Vendor Advisories (2)

pipGHSA-389x-67px-mjg3medium

xgrammar Vulnerable to Denial of Service (DoS) by abusing unbounded cache in memory

Apr 9, 2025
redhatCVE-2025-32381Moderate

xgrammar: xgrammar Vulnerable to Denial of Service (DoS) by abusing unbounded cache in memory

Apr 9, 2025

References

github.com / mlc-ai/xgrammar/pull/243
Issue TrackingPatch
github.com / mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3
Vendor Advisory
github.com / vllm-project/vllm/pull/16283
Issue TrackingPatch