RHSA-2026:28043HighCVSS 7.5

Red Hat Security Advisory: Red Hat OpenStack Platform 17.1 (python-urllib3) security update

Published
June 22, 2026
Last Modified
August 30, 2026

🔗 CVE IDs covered (3)

CVE-2025-66418 →CVE-2025-66471 →CVE-2026-21441 →

📋 Description

CVE-2025-66418 — urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion CVE-2025-66471 — urllib3: urllib3 Streaming API improperly handles highly compressed data CVE-2026-21441 — urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)

🎯 Affected products3

  • Red Hat OpenStack Platform 17.1
  • python-urllib3-0:1.26.5-3.el8ost.3.src as a component of Red Hat OpenStack Platform 17.1
  • python3-urllib3-0:1.26.5-3.el8ost.3.noarch as a component of Red Hat OpenStack Platform 17.1

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.

🔗 References (6)