CVE-2026-59893: sqlparse: Inefficient Regex Handling of Dollar-Quoted SQL Literals Leads to ReDoS (Denial of Service)

Severity: high (CVSS 7.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-08-17 · updated 2026-10-23
Weakness: CWE-1333

Description

sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, SQL_REGEX in sqlparse/keywords.py and the per-position loop in sqlparse/lexer.py repeatedly scan unmatched dollar-quoted literal and multiline-comment delimiters, causing quadratic CPU consumption through sqlparse.parse(), sqlparse.format(), and sqlparse.split(). This issue is fixed in version 0.6.0.

Affected products

Pypi Sqlparse: before 0.6.0; 0.1.0, 0.1.1, 0.1.10, 0.1.11, 0.1.12, 0.1.13 (+32) — fixed in 0.6.0
andialbrecht sqlparse: before 0.6.0

How to fix

Upgrade to a fixed version: Pypi Sqlparse 0.6.0. Check the vendor advisory for mitigations.

References

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