RHSA-2026:79281 — Security Advisory

Red Hat Security Advisory: glibc security, bug fix, and enhancement update

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Severity

Moderate

Red Hat Product Security

RHEL 9

Products

Official CSAF product identity

Published · October 9, 2026

Updated · November 4, 2026

Topic

An update for glibc 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 glibc packages provide the standard C libraries (libc), POSIX thread libraries (libpthread), standard math libraries (libm), and the name service cache daemon (nscd) used by multiple programs on the system. Without these libraries, the Linux system cannot function correctly.

Security Fix(es):

glibc: Glibc: Denial of Service via stack exhaustion during tilde expansion (CVE-2026-6791)
glibc: glibc: Process abort due to invalid memory in wordexp (CVE-2026-6368)
glibc: Fix out-of-bounds array write in tdelete (CVE-2026-19542)
glibc: Non-progress DoS in SHIFT_JISX0213 -&gt (CVE-2026-77117)
glibc: Non-progress DoS in SHIFT_JISX0213 -> UCS-4 conversion state (CVE-2026-80489)
glibc: glibc: Heap buffer overflow via attacker-controlled fopen mode string (CVE-2026-18374)

Bug Fix(es) and Enhancement(s):

glibc: Stop shipping glibc32-debuginfo package (in debug channels) [rhel-9] (JIRA:RHEL-219516)

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.