High [CVE-2026-71491] Denial of Service via quadratic CPU consumption in comment grouping
This high-severity Red Hat Linux advisory covers CVE-2026-71491 affecting Red Hat Ansible Automation Platform 2.5 for RHEL 8, Red Hat Ansible Automation Platform 2.5 for RHEL 9, Red Hat Ansible Automation Platform 2.6 for RHEL 10.
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Summary
sqlparse is a non-validating SQL parser module for Python. Prior to 0.6.0, group_comments in sqlparse/engine/grouping.py repeatedly rescans comment-only statements before the MAX_GROUPING_TOKENS guard, causing quadratic CPU consumption through sqlparse.parse() and sqlparse.format(sql, strip_comments=True).
This issue is fixed in version 0.6.0. A remote attacker could exploit this vulnerability by providing specially crafted SQL input that contains numerous comment-only statements.
This could cause the `group_comments` function to repeatedly rescan these statements, leading to excessive CPU consumption and a Denial of Service (DoS) for the application using the parser. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-1050.
Affected products named by the advisory: Red Hat Ansible Automation Platform 2.5 for RHEL 8; Red Hat Ansible Automation Platform 2.5 for RHEL 9; Red Hat Ansible Automation Platform 2.6 for RHEL 10; Red Hat Ansible Automation Platform 2.6 for RHEL 9; and 14 more.
- < 0.6.0
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
- 0.6.0
- python3.12-sqlparse-0:0.6.0-1.el8ap
- python3.12-sqlparse-0:0.6.0-1.el9ap
- python-sqlparse-0:0.6.0-1.el10ap
- python3.12-sqlparse-0:0.6.0-1.el9pc
- ansible-automation-platform-25/gateway-rhel8:1789605572
- ansible-automation-platform-25/hub-rhel8:1789606395
- ansible-automation-platform-25/lightspeed-rhel8:1789685837
- ansible-automation-platform-26/eda-controller-rhel9:1789653608
- ansible-automation-platform-26/gateway-rhel9:1789666472
- ansible-automation-platform-26/hub-rhel9:1789611274
- ansible-automation-platform-26/lightspeed-rhel9:1789656884
- ansible-automation-platform-tech-preview/metrics-service-rhel9:1789654558
- ansible-automation-platform-27/eda-controller-rhel9:1788917355
- ansible-automation-platform-27/gateway-rhel9:1788918510
- ansible-automation-platform-27/lightspeed-rhel9:1788916677
- ansible-automation-platform-27/metrics-service-rhel9:1788917058
- ansible-automation-platform-27/hub-rhel9:1789572632
- discovery/discovery-server-rhel9:1788205779
- discovery/discovery-server-rhel9:1789675186
- rhoai/odh-training-cuda128-torch29-py312-rhel9:1789529851
- satellite/iop-advisor-backend-rhel9:1789666499
- satellite/iop-advisor-backend-rhel9:1789666498
- RHSA-2026:71114
- RHSA-2026:71113
- RHSA-2026:71112
- RHSA-2026:74504
- RHSA-2026:74503
- RHSA-2026:71210
- RHSA-2026:71179
- RHSA-2026:67279
- RHSA-2026:71177
- RHSA-2026:61783
- RHSA-2026:69289
- RHSA-2026:69539
- RHSA-2026:74643
- RHSA-2026:74648
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
Mitigation
Upgrade to a fixed release: 0.6.0, python3.12-sqlparse-0:0.6.0-1.el8ap, python3.12-sqlparse-0:0.6.0-1.el9ap, python-sqlparse-0:0.6.0-1.el10ap, python3.12-sqlparse-0:0.6.0-1.el9pc, ansible-automation-platform-25/gateway-rhel8:1789605572. That is the remediation for this advisory.
The vendor advisory may list additional interim mitigations or workarounds not captured here — review it before change work.
Official advisory · high-confidence parse· fetched 15 days ago·verify at source
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