CVE-2026-71491 PUBLISHED

sqlparse: Quadratic O(n²) DoS in group_comments

Assigner: GitHub_M
Reserved: 06.08.2026 Published: 17.08.2026 Updated: 17.08.2026

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.

Metrics

CVSS 4.0

CVSS 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
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	andialbrecht
Product	sqlparse
Versions	Version < 0.6.0 is affected

References

Problem Types

CWE-400: Uncontrolled Resource Consumption CWE
CWE-407: Inefficient Algorithmic Complexity CWE