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Fencer Intel
medium 5.1

CVE-2026-84305 json

sqlparse: Reindentation of tuple lists causes near-cap quadratic CPU consumption

published 2mo ago modified 2mo ago also EUVD-2026-69421 , GHSA-cfqr-cjx5-5jcm , PYSEC-2026-3923

cvss
5.1
version 4.0, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.2%
EPSS 0.2% chance of exploitation in 30 days, percentile 8%
public exploits
0
none known

Summary

sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, sqlparse.format(sql, reindent=True) and sqlformat --reindent route attacker-controlled parenthesized tuple lists through ReindentFilter._get_offset() in sqlparse/filters/reindent.py, where _flatten_up_to_token() repeatedly rebuilds and joins the statement prefix. Thousands of offset calculations walk an expanding token tree, producing quadratic CPU consumption for inputs that remain below MAX_GROUPING_TOKENS and causing request delays, reduced throughput, or worker starvation. This issue is fixed in version 0.6.0.

Patch / fix

  • pypi sqlparse 0.6.0
  • sqlparse_project sqlparse 0.6.0
  • python-sqlparse SLE Module for Python 3 15 SP7, SLE Module for Public Cloud 15 SP6 0.4.4-150600.3.12.1
  • python-sqlparse SLE Module for Public Cloud 15 SP5, SLE Module for Public Cloud 15 SP4 0.4.4-150400.6.19.1
  • python-sqlparse SLES for SAP applications 16.0, SLES 16.0 0.5.3-160000.5.1
  • python-sqlparse SLE Module for Package Hub 15 SP7 0.2.4-150100.6.14.1

suse advisories SUSE-SU-2026:4145-1SUSE-SU-2026:4109-1SUSE-SU-2026:23634-1SUSE-SU-2026:3978-1

  • python-sqlparse openSUSE Leap 16.0 0.5.3-160000.5.1

opensuse advisories openSUSE-SU-2026:21777-1

Is CVE-2026-84305 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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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-2026-84305 updated cvss 6.2

sqlparse: sqlparse: Denial of Service via reindentation of tuple lists

  • Red Hat OpenStack Platform 16.2 rhosp-rhel8/openstack-ec2-api, rhosp-rhel8/openstack-tempest, rhosp-rhel8/openstack-heat-all, rhosp-rhel8/openstack-heat-api, rhosp-rhel8/openstack-keystone, rhosp-rhel8/openstack-nova-api, +68 more Red Hat OpenStack Platform 17.1 python-sqlparse, python3-sqlparse, rhosp-rhel9/openstack-horizon, rhosp-rhel9/openstack-tempest, rhosp-rhel9/openstack-aodh-api, rhosp-rhel9/openstack-heat-all, +71 more Red Hat OpenStack Platform 18.0 python-sqlparse, rhoso/openstack-horizon-rhel9, rhoso/openstack-aodh-api-rhel9, rhoso/openstack-heat-api-rhel9, rhoso/openstack-keystone-rhel9, rhoso/openstack-aodh-base-rhel9, +34 more
    under investigation
  • Red Hat OpenStack Platform 13 (Queens) python-sqlparse Red Hat OpenStack Platform 16.2 python3-sqlparse, rhosp-rhel8/openstack-aodh-api, rhosp-rhel8/openstack-aodh-base, rhosp-rhel8/openstack-aodh-notifier, rhosp-rhel8/openstack-barbican-base, rhosp-rhel8/openstack-aodh-evaluator, +3 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

CISA SSVC

Exploitation
Proof of concept is public
Automatable
no
Technical impact
partial
Assessed
2mo ago

Exploit prediction

0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).

Exploits and checks

  • github.com https://github.com/andialbrecht/sqlparse/security/advisories/GHSA-cfqr-cjx5-5jcm referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CNA 4.0 5.1 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
CNA 4.0 5.1 CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Affected packages

ecosystem package affected fixed in
pypi sqlparse
<0.6.0
0.6.0

Affected products

  • andialbrecht sqlparse

Classification

Weakness
  • CWE-407 Inefficient Algorithmic Complexity

References

Sources

Fencer Intel 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.

The maintainers of andialbrecht/sqlparse published their own advisory on GitHub. Reviewed sources take precedence over it.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.