RHSA-2026:97866 - Security Advisory

Topic

An update for openssh 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

OpenSSH is an SSH protocol implementation supported by a number of Linux, UNIX, and similar operating systems. It includes the core files necessary for both the OpenSSH client and server.

Security Fix(es):

• openssh: OpenSSH: SFTP security bypass due to command-line argument parsing flaw (CVE-2026-59997)
• openssh: OpenSSH: Undocumented GSSAPIStrictAcceptorCheck behavior impacts security in Windows Active Directory (CVE-2026-59998)
• openssh: OpenSSH: Denial of Service via excessive GSSAPI authentication attempts (CVE-2026-60000)

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 for x86_64 9 x86_64
• Red Hat Enterprise Linux for IBM z Systems 9 s390x
• Red Hat Enterprise Linux for Power, little endian 9 ppc64le
• Red Hat Enterprise Linux for ARM 64 9 aarch64

Fixes

• BZ - 2497929 - CVE-2026-59997 openssh: OpenSSH: SFTP security bypass due to command-line argument parsing flaw
• BZ - 2497935 - CVE-2026-59998 openssh: OpenSSH: Undocumented GSSAPIStrictAcceptorCheck behavior impacts security in Windows Active Directory
• BZ - 2497946 - CVE-2026-60000 openssh: OpenSSH: Denial of Service via excessive GSSAPI authentication attempts

CVEs

• CVE-2026-59997
• CVE-2026-59998
• CVE-2026-60000

References

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