RHSA-2026:2765 - Security Advisory

Topic

An update is now available for Red Hat Satellite 6.16 for RHEL 8 and RHEL 9.

Red Hat Product Security has rated this update as having a security impact
of Important. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available for each vulnerability
from the CVE link(s) in the References section.

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.

Bug Fix(es):

• Clean duplicate erratum packages before bigint migration (6.16) (SAT-41984)

Security Fix(es):

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

Users of Red Hat Satellite are advised to upgrade to these updated packages,
which fix these bugs.

For more details about the security issue(s), including the impact, a CVSS
score, acknowledgments, and other related information, refer to the CVE
page(s) listed in the References section.

Solution

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Satellite 6.16 for RHEL 9 x86_64
• Red Hat Satellite 6.16 for RHEL 8 x86_64
• Red Hat Satellite Capsule 6.16 for RHEL 9 x86_64
• Red Hat Satellite Capsule 6.16 for RHEL 8 x86_64
• Red Hat Enterprise Linux for x86_64 9 x86_64
• Red Hat Enterprise Linux for x86_64 8 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-41984 - Clean duplicate erratum packages before bigint migration (6.16)

CVEs

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

References

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