CVE-2021-32839

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.

How to fix CVE-2021-32839

To remediate CVE-2021-32839, upgrade the affected package to a fixed version below.

• —upgrade to 0.4.1-1+deb11u1 or later
• —upgrade to 0.4.1-1+deb11u1 or later
• —upgrade to 0.4.2 or later
• —upgrade to 8238a9e450ed1524e40cb3a8b0b3c00606903aeb or later

Is CVE-2021-32839 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (4)

• from 0, < 0.4.1-1+deb11u1
• from 0, < 0.4.1-1+deb11u1
• >= 0.4.0, < 0.4.2
• >= 1499cffcd7c4d635b4297b44d48fb4fe94cf988e, < 8238a9e450ed1524e40cb3a8b0b3c00606903aeb | >= 0.4.0, < 0.4.2

CVSS scores

References (8)

• ADVISORYnvd.nist.gov/vuln/detail/CVE-2021-32839
• ADVISORYsecuritylab.github.com/advisories/GHSL-2021-107-andialbrecht-sqlparse
• ADVISORYsecurity-tracker.debian.org/tracker/CVE-2021-32839
• PATCHgithub.com/andialbrecht/sqlparse