CVE-2026-71491

sqlparse: Quadratic O(n²) DoS in group_comments

Published Aug 17, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, group_comments in sqlparse/engine/grouping.py repeatedly rescans comment-only statements before the MAX_GROUPING_TOKENS guard, causing quadratic CPU consumption through sqlparse.parse() and sqlparse.format(sql, strip_comments=True). This issue is fixed in version 0.6.0.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

Source ID Title
Github GHSA Github GHSA GHSA-f2ff-p2ww-7p4p sqlparse: Quadratic O(n²) DoS in group_comments
Ubuntu USN Ubuntu USN USN-8808-1 SQL parse vulnerabilities
History
Type Values Removed Values Added
Weaknesses CWE-1050
References
Metrics threat_severity

None

cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}

threat_severity

Important

Type Values Removed Values Added
First Time appeared Andialbrecht
Andialbrecht sqlparse
Vendors & Products Andialbrecht
Andialbrecht sqlparse
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, group_comments in sqlparse/engine/grouping.py repeatedly rescans comment-only statements before the MAX_GROUPING_TOKENS guard, causing quadratic CPU consumption through sqlparse.parse() and sqlparse.format(sql, strip_comments=True). This issue is fixed in version 0.6.0.
Title sqlparse: Quadratic O(n²) DoS in group_comments
Weaknesses CWE-400
CWE-407
References
Metrics cvssV4_0

{'score': 8.7, 'vector': '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Aug 17, 2026, 10:01 PM
Reserved
Aug 6, 2026, 7:56 PM
Status
Deferred
Published
Aug 17, 2026, 6:18 PM
Modified
Oct 23, 2026, 4:10 PM
Severity
Important
Public date
Aug 17, 2026, 5:16 PM