# CVE-2026-84305

## Summary

- **CVE ID:** CVE-2026-84305
- **Severity:** MEDIUM
- **CVSS Score:** 5.1 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N)
- **CWE:** CWE-407
- **Published:** Sep 1, 2026
- **Last Modified:** Sep 1, 2026

## Description

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 (< 0.6.0)

## References

- [CNA](https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-cfqr-cjx5-5jcm)
- [CNA](https://github.com/andialbrecht/sqlparse/commit/a51df6d9e2d31b44be9adb6bc8732517db6bf96b)
- [CNA](https://github.com/andialbrecht/sqlparse/releases/tag/0.6.0)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.13%
- **EPSS Percentile:** 2.5

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._