CVE-2026-84305

Medium

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.

SeverityMedium

CVSS5.1

Exploit probability—

ProductSqlparse

PublishedSep 1, 2026

First seenSep 1, 2026

Weakness typeCWE-407CWE-407

How to fix

Update

sqlparse0.6.0 or later

Affected products

Product	Affected versions	Fixed in
sqlparsePyPI	v < 0.6.0	0.6.0

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