CVE-2021-32839

Aliases:GHSA-p5w8-wqhj-9hhfPYSEC-2021-333
Advisory lineage Upstream: 0 Downstream: 8
Modified
Published: 20 Sept 2021, 17:10
Last modified:03 Nov 2025, 21:44

Vulnerability Summary

Overall Risk (default)
medium
30/100
CVSS Score
7.5 HIGH
v3.1 (cve.org)
EPSS Score
0.12% LOW
0% probability +0.01%
KEV
Not listed
Ransomware
No reports
Public exploits
None found
Dark Web
Not detected

Timeline

20 Sept 2021, 17:10
Published
Vulnerability first disclosed
03 Nov 2025, 21:44
Last Modified
Vulnerability information updated

Description

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.

CVSS Metrics

  • v4.0•HIGH•Score: 8.7CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  • v3.1•HIGH•Score: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  • v2.0•MEDIUM•Score: 5AV:N/AC:L/Au:N/C:N/I:N/A:P

EPSS Trends

Current EPSS score: 0.12%• Percentile: 31%

Techniques & Countermeasures

  • CWE-400•Uncontrolled Resource Consumption

    The product does not properly control the allocation and maintenance of a limited resource.

Affected Systems

  • andialbrecht•sqlparse

    ≥ 0.4.0, < 0.4.2

  • PyPI•sqlparse

    ≥ 1499cffcd7c4d635b4297b44d48fb4fe94cf988e, < 8238a9e450ed1524e40cb3a8b0b3c00606903aeb | ≥ 0.4.0, < 0.4.2

  • sqlparse_project•sqlparse

    ≥ 0.4.0, < 0.4.2

References (7)