---
id: CVE-2026-84305
title: sqlparse is a non-validating SQL parser module for Python
summary: >-
  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/…
severity: medium
cwe:
  - CWE-407
vendor: sqlparse
product: sqlparse
affected:
  - sqlparse <= 0.5.5
patched:
  - sqlparse 0.6.0
published: '2026-09-01'
updated: '2026-09-09'
sourceUpdated: '2026-09-09T21:09:13.080'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84305'
references:
  - url: >-
      https://github.com/andialbrecht/sqlparse/commit/a51df6d9e2d31b44be9adb6bc8732517db6bf96b
    label: security-advisories@github.com
  - url: 'https://github.com/andialbrecht/sqlparse/releases/tag/0.6.0'
    label: security-advisories@github.com
  - url: >-
      https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-cfqr-cjx5-5jcm
    label: security-advisories@github.com
  - url: >-
      https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-cfqr-cjx5-5jcm
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://github.com/advisories/GHSA-cfqr-cjx5-5jcm'
  - url: 'https://github.com/andialbrecht/sqlparse'
  - url: 'https://pypi.org/project/sqlparse'
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-84305'
tags:
  - nvd
  - ghsa
  - pip
  - osv
epss: 0.00178
epssPercentile: 0.0651
aliases:
  - GHSA-cfqr-cjx5-5jcm
  - PYSEC-2026-3923
ecosystem: pip
ingestedAt: '2026-09-01T21:32:41.556Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

## Package advisory (CVE-2026-84305)

Affected packages:

- `sqlparse <= 0.5.5`

Patched in:

- `sqlparse 0.6.0`

Source: https://github.com/advisories/GHSA-cfqr-cjx5-5jcm