RHSA-2026:66403 — Security Advisory
Red Hat Security Advisory: coreutils security update
Severity
ModerateRed Hat Product Security
Products
Official CSAF product identity
Published · September 10, 2026
Updated · October 13, 2026
Topic
An update for coreutils is now available for Red Hat Enterprise Linux 9.
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 coreutils packages contain the GNU Core Utilities and represent a combination of the previously used GNU fileutils, sh-utils, and textutils packages.
Security Fix(es):
- coreutils: GNU coreutils unexpand: Denial of Service via crafted tab stop values (CVE-2026-56392)
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.