CVE-2021-32839

sqlparse is a non-validating SQL parser module for Python. In sqlparse versions 0.4.0 and 0.4.1 there is a regular Expression Denial of Service in sqlparse vulnerability. The regular expression may cause exponential backtracking on strings containing many repetitions of '\r\n' in SQL comments. 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 strip_comments=True or the --strip-comments command line flag when using the sqlformat command line tool. The issues has been fixed in sqlparse 0.4.2.

• CWE-400

• https://github.com/andialbrecht/sqlparse/commit/8238a9e450ed1524e40cb3a8b0b3c00606903aebPatch, Third Party Advisory
• https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-p5w8-wqhj-9hhfThird Party Advisory
• https://github.com/andialbrecht/sqlparse/commit/8238a9e450ed1524e40cb3a8b0b3c00606903aebPatch, Third Party Advisory
• https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-p5w8-wqhj-9hhfThird Party Advisory
• https://lists.debian.org/debian-lts-announce/2024/12/msg00022.html

Published

Sep 20, 2021

Last Modified

Jun 17, 2026

Status

Modified

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