Description
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, sqlparse.format(sql, reindent=True) and sqlformat --reindent route attacker-controlled parenthesized tuple lists through ReindentFilter._get_offset() in sqlparse/filters/reindent.py, where _flatten_up_to_token() repeatedly rebuilds and joins the statement prefix. Thousands of offset calculations walk an expanding token tree, producing quadratic CPU consumption for inputs that remain below MAX_GROUPING_TOKENS and causing request delays, reduced throughput, or worker starvation. This issue is fixed in version 0.6.0.
Published: 2026-09-01
Score: 5.1 Medium
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

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Tracking

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-cfqr-cjx5-5jcm sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption
History

Tue, 01 Sep 2026 22:00:00 +0000

Type Values Removed Values Added
Description sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, sqlparse.format(sql, reindent=True) and sqlformat --reindent route attacker-controlled parenthesized tuple lists through ReindentFilter._get_offset() in sqlparse/filters/reindent.py, where _flatten_up_to_token() repeatedly rebuilds and joins the statement prefix. Thousands of offset calculations walk an expanding token tree, producing quadratic CPU consumption for inputs that remain below MAX_GROUPING_TOKENS and causing request delays, reduced throughput, or worker starvation. This issue is fixed in version 0.6.0.
Title sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption
Weaknesses CWE-407
References
Metrics cvssV4_0

{'score': 5.1, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N'}

Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-09-01T19:12:52.039Z

Reserved: 2026-09-01T16:17:43.078Z

Link: CVE-2026-84305

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-01T19:17:30.887

Modified: 2026-09-01T20:17:24.610

Link: CVE-2026-84305

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses
  • CWE-407

    Inefficient Algorithmic Complexity