High [CVE-2026-54284] Denial of Service via quadratic CPU consumption in SQL parsing

sqlparse is a non-validating SQL parser module for Python.

Prior to 0.6.0, TokenList construction and string conversion in sqlparse/sql.py repeatedly flatten nested token subtrees constructed by group_parenthesis and group_case, causing quadratic CPU consumption through sqlparse.parse(), sqlparse.format(), and sqlparse.split() before depth and token limits terminate processing. This issue is fixed in version 0.6.0.

A remote attacker could exploit a vulnerability in the TokenList construction and string conversion processes, specifically when handling nested token subtrees. This flaw leads to quadratic CPU consumption, which can result in a Denial of Service (DoS) by exhausting system resources before internal limits are reached.

Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-1333.

Affected products named by the advisory: Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9; Red Hat Ansible Automation Platform 2.6 for RHEL 10; Red Hat Ansible Automation Platform 2.6 for RHEL 9; and 21 more.

Affected products named by the advisory: Red Hat Ansible Automation Platform 2.7 for RHEL 10; Red Hat Ansible Automation Platform 2.7 for RHEL 9; Red Hat Satellite 6.16 for RHEL 8; Red Hat Satellite 6.16 for RHEL 9; and 17 more.