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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
andialbrecht sqlparse affected
Version Status Constraints
< 0.6.0 affected —

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Project Subscriptions

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Advisories
Source ID Title
Github GHSA Github GHSA GHSA-f2ff-p2ww-7p4p sqlparse: Quadratic O(n²) DoS in group_comments
Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://github.com/andialbrecht/sqlparse/commit/ef2012a5eeb491e604dea2b00d516904a3830c87 cve-icon cve-icon
https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-f2ff-p2ww-7p4p cve-icon cve-icon
History

Mon, 17 Aug 2026 17:30:00 +0000

Type Values Removed Values Added
Description 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.
Title sqlparse: Quadratic O(n²) DoS in group_comments
Weaknesses CWE-400
CWE-407
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-08-17T17:16:48.973Z

Reserved: 2026-08-06T19:56:23.725Z

Link: CVE-2026-71491

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-08-17T18:18:12.120

Modified: 2026-08-17T18:18:12.120

Link: CVE-2026-71491

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-08-17T18:30:04Z

Weaknesses