PT-2025-34711 · Xgrammar · Xgrammar

Xendo · Published 2025-08-25 · Updated 2025-08-26 · CVE-2025-57809

Positive Technologies (AI Summary)

CVSS v4.0

8.7

High

Base vector

AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Name of the Vulnerable Software and Affected Versions: XGrammar versions prior to 0.1.21

Description: XGrammar, an open-source library for structured generation, contains an infinite recursion issue within its grammar. This issue was addressed in version 0.1.21.

Recommendations: Update to version 0.1.21 or later to resolve this issue.

Exploit

Fix

Uncontrolled Recursion

Weakness Enumeration

CWE-674

Related Identifiers

CVE-2025-57809

GHSA-5CMR-4PX5-23PC

Affected Products

Xgrammar

References · 11

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/57xxx/CVE-2025-57809.json · Exploit
• 🔥 https://github.com/mlc-ai/xgrammar/issues/250 · Exploit
• https://github.com/mlc-ai/xgrammar/commit/b943feacb5a1caf4d39de8ec3bf7c7ce066dcee5 · Patch
• https://github.com/mlc-ai/xgrammar/security/advisories/GHSA-5cmr-4px5-23pc · Vendor Advisory
• https://osv.dev/vulnerability/GHSA-5cmr-4px5-23pc · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-57809 · Security Note
• https://osv.dev/vulnerability/CVE-2025-57809 · Vendor Advisory
• https://github.com/mlc-ai/xgrammar · Note
• https://twitter.com/CVEnew/status/1960095306483163495 · Twitter Post
• https://t.me/CVEtracker/30870 · Telegram Post
• https://t.me/cveNotify/133365 · Telegram Post