SB2026042406 - Uncontrolled Recursion in XGrammar
Published: April 24, 2026
Security Bulletin ID
SB2026042406
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Uncontrolled Recursion (CVE-ID: CVE-2026-25048)
CWE-ID: CWE-674 - Uncontrolled Recursion
CVSSv4: CVSS: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:U/U:Green
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to uncontrolled recursion in the grammar compiler when parsing a malicious grammar rule with deeply nested parentheses. A remote attacker can supply a specially crafted grammar input to cause a denial of service.
The issue can result in a segmentation fault, stack overflow, or memory exhaustion.
Remediation
Install update from vendor's website.