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Package "openssh-client"

Name: openssh-client

Description:

secure shell (SSH) client, for secure access to remote machines
Latest version: 1:9.6p1-3ubuntu13.16
Release: noble (24.04)
Level: security
Repository: main
Head package: openssh
Homepage: https://www.openssh.com/

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Repository Area Version
base main 1:9.6p1-3ubuntu13
updates main 1:9.6p1-3ubuntu13.16

Changelog

Version: 1:9.6p1-3ubuntu13.16 2026-04-29 13:08:14 UTC

  openssh (1:9.6p1-3ubuntu13.16) noble-security; urgency=medium

  * SECURITY UPDATE: unexpected scp setuid and setgid
    - debian/patches/CVE-2026-35385.patch: clear setuid/setgid bits from
      downloaded files in scp.c.
    - CVE-2026-35385
  * SECURITY UPDATE: command execution via shell metacharacters in username
    - debian/patches/CVE-2026-35386-pre1.patch: apply validity rules on
      ProxyJump usernames and hostnames in readconf.c, readconf.h, ssh.c.
    - debian/patches/CVE-2026-35386.patch: move username check earlier in
      ssh.c.
    - CVE-2026-35386
  * SECURITY UPDATE: use of unintended ECDSA algorithms
    - debian/patches/CVE-2026-35387_35414.patch: correctly match ECDSA
      signature algorithms against algorithm allowlists in
      auth2-hostbased.c, auth2-pubkey.c, sshconnect2.c.
    - CVE-2026-35387
  * SECURITY UPDATE: missing connection multiplexing confirmation
    - debian/patches/CVE-2026-35388.patch: add missing askpass check in
      mux.c.
    - CVE-2026-35388
  * SECURITY UPDATE: authorized_keys principals option mishandling
    - debian/patches/CVE-2026-35387_35414.patch: check for commas in
      auth2-pubkeyfile.c.
    - CVE-2026-35414

 -- Marc Deslauriers <email address hidden> Mon, 27 Apr 2026 20:29:48 -0400
Source diff to previous version
CVE-2026-35385 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
CVE-2026-35386 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
CVE-2026-35387 OpenSSH before 10.3 can use unintended ECDSA algorithms. Listing of any ECDSA algorithm in PubkeyAcceptedAlgorithms or HostbasedAcceptedAlgorithms is
CVE-2026-35388 OpenSSH before 10.3 omits connection multiplexing confirmation for proxy-mode multiplexing sessions.
CVE-2026-35414 OpenSSH before 10.3 mishandles the authorized_keys principals option in uncommon scenarios involving a principals list in conjunction with a Certific

Version: 1:9.6p1-3ubuntu13.15 2026-03-12 23:09:48 UTC

  openssh (1:9.6p1-3ubuntu13.15) noble-security; urgency=medium

  * SECURITY UPDATE: GSSAPI Key Exchange issue
    - debian/patches/gssapi.patch: replace incorrect use of
      sshpkt_disconnect() with ssh_packet_disconnect() and properly
      initialize some vars.
    - CVE-2026-3497
  * SECURITY UPDATE: Untrusted control characters in usernames
    - debian/patches/CVE-2025-61984.patch: refuse usernames that include
      control characters in ssh.c.
    - CVE-2025-61984
  * SECURITY UPDATE: Code execution in ProxyCommand via NULL character
    - debian/patches/CVE-2025-61985.patch: don't allow \0 characters in
      url-encoded strings in misc.c.
    - CVE-2025-61985

 -- Marc Deslauriers <email address hidden> Wed, 04 Mar 2026 12:55:04 -0500
Source diff to previous version
CVE-2026-3497 Vulnerability in the OpenSSH GSSAPI delta included in various Linux di ...
CVE-2025-61984 ssh in OpenSSH before 10.1 allows control characters in usernames that originate from certain possibly untrusted sources, potentially leading to code
CVE-2025-61985 ssh in OpenSSH before 10.1 allows the '\0' character in an ssh:// URI, potentially leading to code execution when a ProxyCommand is used.

Version: 1:9.6p1-3ubuntu13.11 2025-04-24 14:07:11 UTC

  openssh (1:9.6p1-3ubuntu13.11) noble-security; urgency=medium

  * SECURITY UPDATE: incorrect DisableForwarding directive behaviour
    - debian/patches/CVE-2025-32728.patch: fix logic error in session.c.
    - CVE-2025-32728

 -- Marc Deslauriers <email address hidden> Tue, 22 Apr 2025 07:51:46 -0400
Source diff to previous version
CVE-2025-32728 In sshd in OpenSSH before 10.0, the DisableForwarding directive does not adhere to the documentation stating that it disables X11 and agent forwardin

Version: 1:9.6p1-3ubuntu13.8 2025-02-18 19:07:03 UTC

  openssh (1:9.6p1-3ubuntu13.8) noble-security; urgency=medium

  * SECURITY UPDATE: MitM with VerifyHostKeyDNS option
    - debian/patches/CVE-2025-26465.patch: fix error code handling in
      krl.c, ssh-agent.c, ssh-sk-client.c, sshconnect2.c, sshsig.c.
    - CVE-2025-26465
  * SECURITY UPDATE: pre-authentication denial of service
    - debian/patches/CVE-2025-26466.patch: don't reply to PING in preauth
      or in KEX in packet.c.
    - CVE-2025-26466
  * NOTE: this package does _not_ contain the changes from
    (1:9.6p1-3ubuntu13.7) in noble-proposed.

 -- Marc Deslauriers <email address hidden> Tue, 11 Feb 2025 08:41:04 -0500
Source diff to previous version
CVE-2025-26465 MitM
CVE-2025-26466 Denial of Service: asymmetric resource consumption of memory and CPU

Version: 1:9.6p1-3ubuntu13.4 2024-07-09 17:07:14 UTC

  openssh (1:9.6p1-3ubuntu13.4) noble-security; urgency=medium

  * SECURITY UPDATE: timing attack against echo-off password entry
    - debian/patches/CVE-2024-39894.patch: don't rely on
      channel_did_enqueue in clientloop.c
    - CVE-2024-39894

 -- Marc Deslauriers <email address hidden> Tue, 09 Jul 2024 07:31:27 -0400
CVE-2024-39894 OpenSSH 9.5 through 9.7 before 9.8 sometimes allows timing attacks against echo-off password entry (e.g., for su and Sudo) because of an ObscureKeyst


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