High · CVSS 8.7CVE-2026-71491GHSA-F2FF-P2WW-7P4P

sqlparse: Quadratic O(n²) DoS in group_comments

Answer in brief

CVE-2026-71491 records a High severity (CVSS 8.7) vulnerability in sqlparse: Quadratic O(n²) DoS in group_comments. The current sources do not mark it as known exploited. The current feed maps andialbrecht/sqlparse (generic), sqlparse (pip), sqlparse (pypi). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 17, 2026Updated Sep 10, 2026Source checked Oct 1, 2026First seen by HOL Aug 17, 2026Material review Sep 10, 2026

Upstream Advisory

Key facts

Risk: High · CVSS 8.7
Exploitation: Not marked as known exploited
Affected software: 3 mapped packages or products
Fix availability: Available

Why this deserves its current priority

CVSS is 8.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps andialbrecht/sqlparse (generic), sqlparse (pip), sqlparse (pypi). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
andialbrecht/sqlparsegeneric	< 0.6.0	Not reported
sqlparsepip	<=0.5.5	0.6.0
sqlparsepypi	>=0 <0.6.0	0.6.0

Recommended response

Check inventory. Check lockfiles and deployed manifests for andialbrecht/sqlparse, sqlparse, sqlparse.
Review the reported fix. Update sqlparse to 0.6.0; sqlparse to 0.6.0 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 10, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 17, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.