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Fencer Vulns
high 7.5

CVE-2021-32839 json

Regular Expression Denial of Service in sqlparse

published 2021-09-10 5 y ago modified 2026-07-08 4 mo ago also GHSA-p5w8-wqhj-9hhf , PYSEC-2021-333 , EUVD-2021-0250

cvss
7.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
2.3%
EPSS 2.3% chance of exploitation in 30 days, percentile 83%
public exploits
0
none known

Summary

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.

Patch / fix

  • pypi sqlparse 0.4.2
  • sqlparse_project sqlparse 0.4.2
  • sqlparse Debian 14, Debian 13, Debian 12 0.4.2-1

debian advisories DEBIAN-CVE-2021-32839

  • sqlparse Ubuntu 22.04 LTS 0.4.1-1ubuntu1

ubuntu advisories UBUNTU-CVE-2021-32839

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • foreman satellite utils 6.11, satellite capsule 6.11, satellite 6.11 3.1.1.21-2.el7sat
  • foreman satellite utils 6.11, satellite capsule 6.11, satellite 6.11 3.1.1.21-2.el8sat
  • libsolv satellite capsule 6.11, satellite 6.11 0.7.22-1.el7pc
  • libsolv satellite capsule 6.11, satellite 6.11 0.7.22-1.el8pc
  • candlepin satellite 6.11 4.1.13-1.el7sat
  • candlepin satellite 6.11 4.1.13-1.el8sat
  • satellite satellite utils 6.11, satellite capsule 6.11, satellite 6.11 6.11.0-2.el7sat
  • satellite satellite utils 6.11, satellite capsule 6.11, satellite 6.11 6.11.0-2.el8sat

red hat advisories RHSA-2022:5498

  • python-sqlparse SLE Module for Basesystem 15 SP3 0.4.2-3.3.1

suse advisories SUSE-SU-2021:3857-1

  • python-sqlparse openSUSE Tumbleweed 0.5.5-2.1
  • python-sqlparse openSUSE Tumbleweed 0.4.2-1.1
  • python-sqlparse openSUSE Tumbleweed 0.5.0-1.1
  • python-sqlparse openSUSE Leap 15.3 0.4.2-3.3.1

opensuse advisories openSUSE-SU-2026:11221-1openSUSE-SU-2024:11581-1openSUSE-SU-2024:13938-1openSUSE-SU-2021:3857-1

  • libdb Rocky Linux 8 5.3.28-42.el8_4

rocky linux advisories RLSA-2022:5498

  • py3-sqlparse Alpine 3.24, Alpine 3.23, Alpine 3.22 +8 more 0.4.2-r0

alpine advisories ALPINE-CVE-2021-32839

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • python-sqlparse Arch Linux 0.4.2-1

arch linux advisories AVG-2401

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2021-32839 updated cvss 7.5

python-sqlparse: ReDoS via regular expression in StripComments filter

  • Red Hat Ansible Automation Platform 1.2 sqlparse, python-sqlparse
    affected: workaround, no fix available “As mitigation, 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.”
  • Red Hat Ansible Tower 3 sqlparse Red Hat OpenStack Platform 10 (Newton) python-sqlparse Red Hat OpenStack Platform 13 (Queens) python-sqlparse
    affected: workaround, no fix planned “As mitigation, 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.”
  • Red Hat Satellite 6.11 for RHEL 8 python-sqlparse 0.4.2-2.el8pc
    fixed: vendor fix “As mitigation, 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.” RHSA-2022:5498
  • Red Hat OpenStack Platform 16.1 python3-sqlparse Red Hat OpenStack Platform 16.2 python3-sqlparse Red Hat Satellite 6.11 for RHEL 7 tfm 7.0-1.el7sat, gofer 2.12.5-7.el7sat, katello 4.3.0-3.el7sat, libsolv 0.7.22-1.el7pc, libcomps 0.1.18-1.el7pc, libsolv0 0.6.34-4.el7sat, +638 more Red Hat Satellite 6.11 for RHEL 8 libdb 5.3.28-42.el8_4, katello 4.3.0-3.el8sat, libsolv 0.7.22-1.el8pc, libcomps 0.1.18-1.el8pc, python-idna 3.3-1.el8pc, python-pbr 5.6.0-1.el8pc, +628 more
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.34% chance of exploitation in the next 30 days, higher than 83% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
CNA 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P
GitHub 3.1 7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi sqlparse
>=0.4.0, <0.4.2
0.4.2

Affected products

  • andialbrecht sqlparse

Classification

Weakness
  • CWE-400 Uncontrolled Resource Consumption

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.