Resource exhaustion in Sqlparse - CVE-2026-71491

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Main Vulnerability Database Vulnerabilities #VU142413

Resource exhaustion in Sqlparse - CVE-2026-71491

Published: August 13, 2026


Vulnerability identifier: #VU142413
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-2026-71491
CWE-ID: CWE-400
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 uncontrolled resource consumption in the group_comments function when parsing a comment-only SQL statement. A remote attacker can supply many single-line comments to consume excessive CPU resources and cause a denial of service.

The issue is reachable via sqlparse.parse() and sqlparse.format(sql, strip_comments=true), and the quadratic cost is incurred before the token-count guard is applied.


Affected software

Sqlparse
SUSE Linux Enterprise Server 15 SP6
SUSE Linux Enterprise Server 15 SP5
SUSE Linux Enterprise Server 15 SP4
SUSE Linux Enterprise Server 15
SUSE Linux Enterprise High Performance Computing 15
SUSE Linux Enterprise Server for SAP Applications 15
SUSE Linux Enterprise High Performance Computing LTSS 15
SUSE Linux Enterprise High Performance Computing ESPOS 15
SUSE Linux Enterprise Real Time 15
SUSE Linux Enterprise Desktop 15
SUSE Manager Server
SUSE Manager Retail Branch Server
SUSE Manager Proxy
Public Cloud Module
Python 3 Module
Basesystem Module
SUSE Package Hub 15
openSUSE Leap
Ubuntu
openEuler
sqlparse (Ubuntu package)
python2-sqlparse
python3-sqlparse
python311-sqlparse
python-sqlparse
python3.12-sqlparse (Red Hat package)
python-sqlparse (Red Hat package)
receptor (Red Hat package)
automation-controller-cli (Red Hat package)
Ansible Automation Platform

How to mitigate CVE-2026-71491

Install security update from vendor's website.

Sqlparse - update to 0.6.0
sqlparse (Ubuntu package) - addressed in versions 0.1.18-1ubuntu0.1~esm1, 0.2.4-0.1ubuntu0.1+esm1, 0.2.4-3ubuntu0.1+esm1, 0.4.2-1ubuntu0.22.04.3, 0.4.4-1ubuntu0.2, 0.5.4-1ubuntu0.1
python2-sqlparse - update to 0.2.4-150100.6.11.1
python3-sqlparse - update to 0.4.2-150300.23.1
python311-sqlparse - addressed in versions 0.4.4-150400.6.16.1, 0.4.4-150600.3.9.1
python3-sqlparse - update to 0.6.0-1
python-sqlparse - update to 0.6.0-1
python3.12-sqlparse (Red Hat package) - update to 0.6.0-1.el9ap
python-sqlparse (Red Hat package) - update to 0.6.0-1.el10ap
receptor (Red Hat package) - addressed in versions 1.6.8-1.el9ap, 1.6.8-1.el10ap
Ansible Automation Platform - update to 2.7
automation-controller-cli (Red Hat package) - addressed in versions 4.8.9-1.el9ap, 4.8.9-1.el10ap

External References

Related Security Bulletins