CVE-2026-54284

sqlparse: TokenList.__init__ materializes O(subtree) value per group, causing CPU DoS before depth/token caps trigger

State: Published
Severity: 8.7 High
Published: Aug 17, 2026
Updated: Aug 17, 2026
Reserved: Jun 12, 2026

Description

sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, TokenList construction and string conversion in sqlparse/sql.py repeatedly flatten nested token subtrees constructed by group_parenthesis and group_case, causing quadratic CPU consumption through sqlparse.parse(), sqlparse.format(), and sqlparse.split() before depth and token limits terminate processing. This issue is fixed in version 0.6.0.

Scores

CVSS	Score	Vector	Source
4.0	8.7 High	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	GitHub_M

Weaknesses

CWE-407 Inefficient Algorithmic Complexity
CWE-1333 Inefficient Regular Expression Complexity

Affected Products

Product	Versions
sqlparseandialbrecht	< 0.6.0Affected

References

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