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, Red Hat Discovery 2, Red Hat OpenShift AI (RHOAI).
Android app · Google Play
Monitor future Red Hat Linux CVEs from your phone.
Choose a whole vendor or a precise platform, then receive matching security advisories by phone notification, email, or both. Coverage follows 32 official vendor sources and 160+ reviewed platform categories.
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 Red Hat products: Red Hat Ansible Automation Platform 2; Red Hat Discovery 2; Red Hat OpenShift AI (RHOAI); Red Hat OpenShift Container Platform 4; Red Hat OpenStack Platform 16.2; Red Hat OpenStack Platform 17.1; Red Hat OpenStack Platform 18.0; Red Hat Satellite 6; Red Hat Update Infrastructure 4 for Cloud Providers; Red Hat Update Infrastructure 5; Self-service automation portal 2.
Red Hat does not currently list a fixing RHSA for this CVE.
- < 0.6.0
Official advisory · high-confidence parse· fetched 38 minutes ago·verify at source
- 0.6.0
Official advisory · high-confidence parse· fetched 38 minutes ago·verify at source
Mitigation
Upgrade to a fixed release: 0.6.0. 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 38 minutes ago·verify at source
Discussion(0)
No comments yet. Share field notes, upgrade gotchas, or questions — verify against the vendor advisory before acting on community advice.
Sign in to join the discussion.