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CVE-2026-84305— sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption

Quick assessment

Affected
andialbrecht sqlparse
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Andi Albrecht sqlparse是Andi Albrecht个人开发者的一个解析SQL语句的库。 Andi Albrecht sqlparse 0.6.0之前版本存在资源管理错误漏洞，该漏洞源于sqlparse.format(sql, reindent=True)和sqlformat --reindent将攻击者控制的括号元组列表通过ReindentFilter._get_offset()函数处理，其中_flatten_up_to_token()函数重复重建和连接语句前缀，导致二次CPU消耗，

CVSS 5.1 · Medium EPSS 0.19% · P8

Affected Version Matrix 1

VendorProduct Version RangeStatus
andialbrecht sqlparse < 0.6.0 affected
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I. Basic Information for CVE-2026-84305

Vulnerability Information
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Vulnerability Title
sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
算法复杂性
Source: CVE Program / CVE List V5
Vulnerability Title
Andi Albrecht sqlparse 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Andi Albrecht sqlparse是Andi Albrecht个人开发者的一个解析SQL语句的库。 Andi Albrecht sqlparse 0.6.0之前版本存在资源管理错误漏洞，该漏洞源于sqlparse.format(sql, reindent=True)和sqlformat --reindent将攻击者控制的括号元组列表通过ReindentFilter._get_offset()函数处理，其中_flatten_up_to_token()函数重复重建和连接语句前缀，导致二次CPU消耗，
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
andialbrecht sqlparse < 0.6.0 -

II. Public POCs for CVE-2026-84305

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III. Intelligence Information for CVE-2026-84305

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Patches & Fixes for CVE-2026-84305 (1)

Vendor Advisories for CVE-2026-84305 (1)

Vendor Pages for CVE-2026-84305 (1)

IV. Related Vulnerabilities

Same product: sqlparse
Same vendor: andialbrecht
Same weakness: CWE-407

V. Comments for CVE-2026-84305

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