PT-2025-15757 · Xgrammar · Xgrammar

Russellb · CVE-2025-32381 · Published 2025-04-09 · Updated 2025-09-17

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: XGrammar versions prior to 0.1.18

Description: The issue concerns an unbounded cache for compiled grammars in memory, which can be exploited to cause a denial of service by filling up a host's memory. This can occur when a system using XGrammar receives many small requests with unique JSON schemas, such as sending multiple requests to an LLM inference server.

Recommendations: For versions prior to 0.1.18, update to version 0.1.18 to resolve the issue.

Exploit

Fix

DoS

Allocation of Resources Without Limits

Weakness Enumeration

CWE-770

Related Identifiers

CVE-2025-32381

GHSA-389X-67PX-MJG3

PYSEC-2025-235

Affected Products

Xgrammar

References · 13

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/32xxx/CVE-2025-32381.json · Exploit
• https://github.com/vllm-project/vllm/pull/16283 · Patch
• https://github.com/mlc-ai/xgrammar/pull/243 · Patch
• https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-389x-67px-mjg3 · Vendor Advisory
• https://osv.dev/vulnerability/PYSEC-2025-235 · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-389x-67px-mjg3 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-32381 · Security Note
• https://osv.dev/vulnerability/CVE-2025-32381 · Vendor Advisory
• https://github.com/mlc-ai/xgrammar · Note
• https://github.com/pypa/advisory-database/tree/main/vulns/xgrammar/PYSEC-2025-235.yaml · Note
• https://twitter.com/CVEnew/status/1910073449340370992 · Twitter Post
• https://twitter.com/VulmonFeeds/status/1910009244943851935 · Twitter Post
• https://t.me/cveNotify/135690 · Telegram Post