========================================================================== Ubuntu Security Notice USN-8533-1 July 13, 2026
openssh vulnerabilities ========================================================================== A security issue affects these releases of Ubuntu and its derivatives: - Ubuntu 26.04 LTS - Ubuntu 24.04 LTS - Ubuntu 22.04 LTS Summary: Several security issues were fixed in OpenSSH. Software Description: - openssh: secure shell (SSH) for secure access to remote machines Details: It was discovered that OpenSSH sftp did not properly constrain the location of downloaded files when connecting to an attacker-controlled server. An attacker could possibly use this issue to write files to unintended locations on the file system. (CVE-2026-59995) It was discovered that OpenSSH scp could place files in the parent directory of the intended destination when copying between two remote hosts. An attacker could possibly use this issue to write files to unintended locations. (CVE-2026-59996) It was discovered that OpenSSH internal-sftp only recognized the first nine command-line arguments, This could result in certain security-sensitive arguments being ignored, contrary to expectations. (CVE-2026-59997) It was discovered that OpenSSH had undocumented behaviour regarding the GSSAPIStrictAcceptorCheck option in environments using Windows Active Directory. The documentation has been updated to clarify use of the option. (CVE-2026-59998) It was discovered that OpenSSH did not properly enforce precedence of DisableForwarding=yes over PermitTunnel=yes in server configurations. This could possibly result in intended network forwarding restrictions being bypassed, contrary to expectations. (CVE-2026-59999) It was discovered that OpenSSH mishandled the MaxAuthTries limit for GSSAPI authentication. A remote attacker could use this issue to perform excessive authentication attempts. (CVE-2026-60000) It was discovered that OpenSSH did not always honour the minimum authentication delay. An attacker could possibly use this issue to perform brute-force attacks more efficiently. (CVE-2026-60001) It was discovered that the OpenSSH client had a use-after-free vulnerability when a server changed its host key during a key re-exchange. An attacker able to intercept communications could possibly use this issue to execute arbitrary code or obtain sensitive information. (CVE-2026-60002) Update instructions: The problem can be corrected by updating your system to the following package versions: Ubuntu 26.04 LTS openssh-client 1:10.2p1-2ubuntu3.4 openssh-server 1:10.2p1-2ubuntu3.4 Ubuntu 24.04 LTS openssh-client 1:9.6p1-3ubuntu13.18 openssh-server 1:9.6p1-3ubuntu13.18 Ubuntu 22.04 LTS openssh-client 1:8.9p1-3ubuntu0.16 openssh-server 1:8.9p1-3ubuntu0.16 In general, a standard system update will make all the necessary changes. References: https://ubuntu.com/security/notices/USN-8533-1 CVE-2026-59995, CVE-2026-59996, CVE-2026-59997, CVE-2026-59998, CVE-2026-59999, CVE-2026-60000, CVE-2026-60001, CVE-2026-60002 Package Information: https://launchpad.net/ubuntu/+source/openssh/1:10.2p1-2ubuntu3.4 https://launchpad.net/ubuntu/+source/openssh/1:9.6p1-3ubuntu13.18 https://launchpad.net/ubuntu/+source/openssh/1:8.9p1-3ubuntu0.16
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