Inefficient regular expression complexity in Sqlparse - CVE-2021-32839
Published: September 10, 2021 / Updated: August 13, 2026
Vulnerability identifier: #VU142410
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2021-32839
CWE-ID: CWE-1333
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to inefficient regular expression complexity in StripComments filter when parsing crafted SQL input. A remote attacker can supply specially crafted input to cause a denial of service.
Affected software
Sqlparse
How to mitigate CVE-2021-32839
Install security update from vendor's website.
Sqlparse - update to 0.4.2