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ALSA-2026:13380 — Important: openssh security update

Affected: AlmaLinux:10: openssh, AlmaLinux:10: openssh-askpass, AlmaLinux:10: openssh-clients, AlmaLinux:10: openssh-keycat, AlmaLinux:10: openssh-keysign, AlmaLinux:10: openssh-server

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: Privilege escalation via scp legacy protocol when not preserving file mode (CVE-2026-35385) * OpenSSH: OpenSSH: Security bypass via mishandling of authorized_keys principals option (CVE-2026-35414) * OpenSSH: OpenSSH: Information disclosure due to unintended cryptographic algorithm usage (CVE-2026-35387) * OpenSSH: OpenSSH: Low integrity impact from unconfirmed proxy-mode multiplexing sessions (CVE-2026-35388) * OpenSSH: OpenSSH: Arbitrary command execution via shell metacharacters in username (CVE-2026-35386)

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.

bdu:2026-12819

BELL-CVE-2026-35387

Affected: Alpaquita:25: openssh, Alpaquita:stream: openssh, BellSoft Hardened Containers:25: openssh, BellSoft Hardened Containers:stream: openssh

certfr-2026-avi-0667 — De multiples vulnérabilités ont été découvertes dans les produits IBM. Certaines d'entre elles permettent à un attaquan…

certfr-2026-avi-0667

EUVD-2026-280115

fkie_cve-2026-35387

OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

GHSA-hpxh-vgmp-3qp6

OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

msrc_CVE-2026-35387 — CVE-2026-35387

msrc_CVE-2026-35387

OESA-2026-1963 — openssh security update

Affected: openEuler:24.03-LTS-SP1: openssh, openEuler:24.03-LTS-SP2: openssh, openEuler:24.03-LTS-SP3: openssh, openEuler:20.03-LTS-SP4: openssh, openEuler:22.03-LTS-SP4: openssh, openEuler:24.03-LTS: openssh

An open source implementation of SSH protocol version 2 Security Fix(es):

Vulnerability in the OpenSSH GSSAPI delta included in various Linux distributions. This vulnerability affects the GSSAPI patches added by various Linux distributions and does not affect the OpenSSH upstream project itself. The usage of sshpkt_disconnect() on an error, which does not terminate the process, allows an attacker to send an unexpected GSSAPI message type during the GSSAPI key exchange to the server, which will call the underlying function and continue the execution of the program without setting the related connection variables. As the variables are not initialized to NULL the code later accesses those uninitialized variables, accessing random memory, which could lead to undefined behavior. The recommended workaround is to use ssh_packet_disconnect() instead, which does terminate the process. The impact of the vulnerability depends heavily on the compiler flag hardening configuration.(CVE-2026-3497)

In OpenSSH before 10.3, a file downloaded by scp may be installed setuid or setgid, an outcome contrary to some users' expectations, if the download is performed as root with -O (legacy scp protocol) and without -p (preserve mode).(CVE-2026-35385)

In OpenSSH before 10.3, command execution can occur via shell metacharacters in a username within a command line. This requires a scenario where the username on the command line is untrusted, and also requires a non-default configurations of…

RHSA-2026:12389 — Red Hat Security Advisory: openssh security update

OpenSSH: OpenSSH: Privilege escalation via scp legacy protocol when not preserving file mode OpenSSH: OpenSSH: Arbitrary command execution via shell metacharacters in username OpenSSH: OpenSSH: Information disclosure due to unintended cryptographic algorithm usage OpenSSH: OpenSSH: Low integrity impact from unconfirmed proxy-mode multiplexing sessions OpenSSH: OpenSSH: Security bypass via mishandling of authorized_keys principals option

RHSA-2026:13380 — Red Hat Security Advisory: openssh security update

UBUNTU-CVE-2026-35387

Affected: Ubuntu:Pro:14.04:LTS: openssh, Ubuntu:Pro:16.04:LTS: openssh, Ubuntu:Pro:FIPS:16.04:LTS: openssh, Ubuntu:Pro:18.04:LTS: openssh, Ubuntu:18.04:LTS: openssh-ssh1, Ubuntu:Pro:FIPS-updates:18.04:LTS: openssh, Ubuntu:Pro:FIPS:18.04:LTS: openssh, Ubuntu:Pro:20.04:LTS: openssh, Ubuntu:20.04:LTS: openssh-ssh1, Ubuntu:Pro:FIPS-updates:20.04:LTS: openssh and 12 more

OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is misinterpreted to mean all ECDSA algorithms.

WID-SEC-W-2026-0979 — OpenSSH: Mehrere Schwachstellen

Ein entfernter Angreifer kann mehrere Schwachstellen in OpenSSH ausnutzen, um Code auszuführen, Privilegien zu erhöhen, Sicherheitsmechanismen zu umgehen oder nicht näher spezifizierte Auswirkungen zu erzielen.