RHSA-2026:2760 - Security Advisory

Topic

A new release is now available for Red Hat Satellite 6.18 for 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.

Security Fix(es):

• python-aiohttp: AIOHTTP HTTP Request/Response Smuggling (CVE-2025-53643)
• python3.12-urllib3: urllib3 vulnerable to decompression-bomb safeguard bypass when following HTTP redirects (streaming API) (CVE-2026-21441)
• python3.12-urllib3: urllib3 Streaming API improperly handles highly compressed data (CVE-2025-66471)

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://access.redhat.com/documentation/en-us/red_hat_satellite/6.18/html/updating_red_hat_satellite/index

Affected Products

• Red Hat Satellite 6.18 x86_64
• Red Hat Satellite Capsule 6.18 x86_64
• Red Hat Enterprise Linux for x86_64 9 x86_64

Fixes

• BZ - 2380000 - CVE-2025-53643 aiohttp: AIOHTTP HTTP Request/Response Smuggling
• 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-35237 - The Insights Inventory report is not generated within "/var/lib/foreman/red_hat_inventory/generated_reports/" on Satellite 6.18
• SAT-39454 - rubygem-hammer_cli_foreman_bootdisk-0.4.1-2 has untranslated messages
• SAT-41521 - 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-41522 - N-1/N-2 Capsule sync fails with error Unable to update hosts ([RestClient::NotFound]: 404 Not Found)
• SAT-41523 - Firmware type always reverts to Automatic for Compute Profiles in Satellite
• SAT-41524 - Provide a check that subscription-manager release is not set
• SAT-41525 - No repositories available through subscriptions on a host after registering it to Red Hat Satellite using global registration method
• SAT-41526 - Capsule upgrade fails with a package conflict error despite the required repositories being enabled.
• SAT-41527 - Allow users with EXTERNAL authentication to have blank mail
• SAT-41528 - Incorrect documentation link under Red Hat Lightspeed ? Inventory Upload in Satellite Web UI
• SAT-42125 - Custom yum repo sync over authed proxy fails

CVEs

• CVE-2025-53643
• CVE-2025-66471
• CVE-2026-21441

References

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