RHSA-2026:0930 - Security Advisory

Topic

An update for pcs is now available for Red Hat Enterprise Linux 8.

Red Hat Product Security has rated this update as having a security impact of Moderate. 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 pcs packages provide a command-line configuration system for the Pacemaker and Corosync utilities.

Security Fix(es):

• tornado: Tornado Quadratic DoS via Repeated Header Coalescing (CVE-2025-67725)
• tornado: Tornado Quadratic DoS via Crafted Multipart Parameters (CVE-2025-67726)

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 8 x86_64
• Red Hat Enterprise Linux High Availability for ARM 64 8 aarch64
• Red Hat Enterprise Linux Resilient Storage for x86_64 8 x86_64
• Red Hat Enterprise Linux Resilient Storage for IBM z Systems 8 s390x
• Red Hat Enterprise Linux High Availability for IBM z Systems 8 s390x
• Red Hat Enterprise Linux Resilient Storage for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux High Availability for Power, little endian 8 ppc64le
• Red Hat Enterprise Linux High Availability for ARM 64 - Extended Life Cycle 8.10 aarch64
• Red Hat Enterprise Linux High Availability for Power, little endian - Extended Life Cycle 8.10 ppc64le
• Red Hat Enterprise Linux High Availability for IBM z Systems - Extended Life Cycle 8.10 s390x
• Red Hat Enterprise Linux High Availability for x86_64 - Extended Life Cycle 8.10 x86_64
• Red Hat Enterprise Linux Resilient Storage for Power, little endian - Extended Life Cycle 8.10 ppc64le
• Red Hat Enterprise Linux Resilient Storage for IBM z Systems - Extended Life Cycle 8.10 s390x
• Red Hat Enterprise Linux Resilient Storage for x86_64 - Extended Life Cycle 8.10 x86_64

Fixes

• BZ - 2421722 - CVE-2025-67725 tornado: Tornado Quadratic DoS via Repeated Header Coalescing
• BZ - 2421733 - CVE-2025-67726 tornado: Tornado Quadratic DoS via Crafted Multipart Parameters

CVEs

• CVE-2025-67725
• CVE-2025-67726

References

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