Impact The formatter function that strips comments from a SQL contains a regular expression that is vulnerable to ReDoS (Regular Expression Denial of Service). The regular expression may cause exponential backtracking on strings containing many repetitions of '\r\n' in SQL comments.

Patches The issues has been fixed in sqlparse 0.4.2.

Workarounds Only the formatting feature that removes comments from SQL statements is affected by this regular expression. As a workaround don't use the sqlformat.format function with keyword stripcomments=True or the --strip-comments command line flag when using the sqlformat command line tool.

References This issue was discovered by GitHub team members @erik-krogh and @yoff. It was found using a CodeQL query which identifies inefficient regular expressions. You can see the results of the query on python-sqlparse by following this link.

For more information If you have any questions or comments about this advisory: Open an issue in sqlparse issue tracker Email us at albrecht.andi@gmail.com