CVE-2026-84305: Andialbrecht Sqlparse

Medium severity, CVSS 5.1. EPSS: 0.2% chance of exploitation in the next 30 days.

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.

Affected products

• Andialbrecht Sqlparse: before 0.6.0 (fixed in 0.6.0)

Published 2026-09-01. Last modified 2026-09-09.