RHSA-2026:76748 - Security Advisory

Topic

An update for openssh is now available for Red Hat Enterprise Linux 10.0 Extended Update Support.

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

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: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions (CVE-2026-55655)
• openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service (CVE-2026-55653)
• openssh: OpenSSH: sftp client allows attacker to control downloaded file location (CVE-2026-59995)
• openssh: OpenSSH: Brute-force attacks facilitated due to insufficient authentication delay (CVE-2026-60001)
• openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options (CVE-2026-59999)
• openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy (CVE-2026-59996)
• openssh: OpenSSH: Information disclosure and data corruption via use-after-free in ssh client (CVE-2026-73282)

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 - Extended Update Support 10.0 x86_64
• Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - Extended Update Support 10.0 ppc64le
• Red Hat Enterprise Linux for ARM 64 - Extended Update Support 10.0 aarch64
• Red Hat Enterprise Linux for ARM 64 - 4 years of updates 10.0 aarch64
• Red Hat Enterprise Linux for IBM z Systems - 4 years of updates 10.0 s390x
• Red Hat Enterprise Linux for Power, little endian - 4 years of support 10.0 ppc64le
• Red Hat Enterprise Linux for x86_64 - 4 years of updates 10.0 x86_64

Fixes

• BZ - 2462250 - CVE-2026-55655 openssh: Local MITM of X11 forwarding via abstract UNIX socket pre-binding in Red Hat Enterprise Linux OpenSSH client versions
• BZ - 2462351 - CVE-2026-55653 openssh: Double free in Red Hat Enterprise Linux versions of OpenSSH DH-GEX client path during FIPS known-group validation leads to client-side denial of service
• BZ - 2497927 - CVE-2026-59995 openssh: OpenSSH: sftp client allows attacker to control downloaded file location
• BZ - 2497938 - CVE-2026-60001 openssh: OpenSSH: Brute-force attacks facilitated due to insufficient authentication delay
• BZ - 2497942 - CVE-2026-59999 openssh: OpenSSH sshd: Security bypass due to incorrect handling of forwarding and tunneling options
• BZ - 2497944 - CVE-2026-59996 openssh: OpenSSH: `scp` file misplacement vulnerability during remote copy
• BZ - 2514328 - CVE-2026-73282 openssh: OpenSSH: Information disclosure and data corruption via use-after-free in ssh client

CVEs

• CVE-2026-55653
• CVE-2026-55655
• CVE-2026-59995
• CVE-2026-59996
• CVE-2026-59999
• CVE-2026-60001
• CVE-2026-73282

References

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