RHSA-2026:2764 - Security Advisory

Topic

A new release is now available for Red Hat Satellite 6.17 for RHEL 9.

Description

Red Hat Satellite is a system management solution that allows organizations
to configure and maintain their systems without the necessity to provide
public Internet access to their servers or other client systems. It
performs provisioning and configuration management of predefined standard
operating environments.

Security Fix(es):

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

Bug Fix(es):

• Satellite upgrade from 6.17.5 to 6.18 failed during Pulpcore database migration due to incompatible versions detected for some of the pulpcore plugins (SAT-41761)

Solution

Before applying this update, make sure all previously released errata
relevant to your system have been applied.

For detailed instructions how to apply this update, refer to:

https://docs.redhat.com/en/documentation/red_hat_satellite/6.17/html/updating_red_hat_satellite/index

Affected Products

• Red Hat Satellite 6.17 x86_64
• Red Hat Satellite Capsule 6.17 x86_64
• Red Hat Enterprise Linux for x86_64 9 x86_64

Fixes

• BZ - 2419455 - CVE-2025-66418 urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion
• BZ - 2419467 - CVE-2025-66471 urllib3: urllib3 Streaming API improperly handles highly compressed data
• BZ - 2427726 - CVE-2026-21441 urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API)
• SAT-41761 - Satellite upgrade from 6.17.5 to 6.18 failed during Pulpcore database migration due to incompatible versions detected for some of the pulpcore plugins [satellite-6.17.z]

CVEs

• CVE-2025-66418
• CVE-2025-66471
• CVE-2026-21441

References

• https://access.redhat.com/security/updates/classification/#important