Inefficient Algorithmic Complexity in Sqlparse - CVE-2026-54284
Published: August 13, 2026
Vulnerability identifier: #VU142416
CSH Severity: Medium
CVSS v4: 8.7 [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]
CVE-ID: CVE-2026-54284
CWE-ID: CWE-407
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient algorithmic complexity in TokenList.__init__ when parsing attacker-supplied SQL with deeply nested grouping constructs. A remote attacker can send a specially crafted SQL input to cause a denial of service.
The issue is reachable through the default sqlparse.parse, sqlparse.format, and sqlparse.split entry points, and nested parentheses, nested CASE WHEN expressions, nested subqueries, or nested ARRAY[] literals can trigger excessive CPU consumption before parser depth and token caps raise an error.
Affected software
Sqlparse
How to mitigate CVE-2026-54284
Install security update from vendor's website.
Sqlparse - update to 0.6.0