RHSA-2026:1338 - Security Advisory

Topic

An update for resource-agents is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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

The resource-agents packages provide the Pacemaker and RGManager service managers with a set of scripts. These scripts interface with several services to allow operating in a high-availability (HA) environment.

Security Fix(es):

• urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion (CVE-2025-66418)

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

For details on how to apply this update, which includes the changes described in this advisory, refer to:

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

Affected Products

• Red Hat Enterprise Linux High Availability for x86_64 - Advanced Update Support 8.4 x86_64
• Red Hat Enterprise Linux High Availability for x86_64 - Extended Update Support Extension 8.4 x86_64

Fixes

• BZ - 2419455 - CVE-2025-66418 urllib3: urllib3: Unbounded decompression chain leads to resource exhaustion

CVEs

• CVE-2025-66418

References

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