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CVE-2026-71491— sqlparse: Quadratic O(n²) DoS in group_comments

Quick assessment

Affected
andialbrecht sqlparse
Exploitation
Public or AI PoC available; prioritize validation
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group_comments在MAX_GROUPING_TOKENS保护之前重复重新扫描仅注释语句，导致CPU消耗呈二次方增长。

CVSS 8.7 · High EPSS 0.26% · P18

Possible ATT&CK Techniques 1 AI

T1496 · Resource Hijacking

Affected Version Matrix 1

VendorProduct Version RangeStatus
andialbrecht sqlparse < 0.6.0 affected
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I. Basic Information for CVE-2026-71491

Vulnerability Information
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Vulnerability Title
sqlparse: Quadratic O(n²) DoS in group_comments
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
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
Source: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
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group_comments在MAX_GROUPING_TOKENS保护之前重复重新扫描仅注释语句，导致CPU消耗呈二次方增长。
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-2026-71491

# POC Description Source Link Shenlong Link
AI-Generated POC Premium
Qwen3.6-35B-A3B · 7722 chars
Pro+ exclusive includes:
Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
In-depth vulnerability mechanism
Trigger conditions & impact
Full executable POC code
Exploit chain & mitigation
POC zip download
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III. Intelligence Information for CVE-2026-71491

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Patches & Fixes for CVE-2026-71491 (1)

Vendor Advisories for CVE-2026-71491 (1)

Same Patch Batch · andialbrecht · 2026-08-17 · 4 CVEs total

CVE-2026-54284 8.7 HIGH sqlparse: TokenList.__init__ materializes O(subtree) value per group, causing CPU DoS befo
CVE-2026-59893 7.5 HIGH sqlparse: Inefficient Regex Handling of Dollar-Quoted SQL Literals Leads to ReDoS (Denial
CVE-2026-59894 6.2 MEDIUM sqlparse: Generated Python and PHP snippets allow SQL string breakout through unescaped ba

IV. Related Vulnerabilities

Same product: sqlparse
Same vendor: andialbrecht
Same weakness: CWE-400

V. Comments for CVE-2026-71491

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