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A flaw was found in libssh. The API function `ssh_get_hexa()` is vulnerable to a denial of service when processing zero-length input. This can be exploited remotely by an attacker during GSSAPI (Generic Security Service Application Program Interface) authentication if the server's logging verbosity is set to `SSH_LOG_PACKET (3)` or higher. Successful exploitation could lead to a self-Denial of Service of the per-connection daemon process.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade libssh-develUpgrade libssh-configUpgrade libssh | May 27, 2026 | May 19, 2026 |
| Alpine Linux | — | Upgrade libssh | Apr 13, 2026 | Mar 26, 2026 |
| Amazon_linux_2023 | — | Upgrade libssh-develUpgrade libsshUpgrade libssh-debuginfoUpgrade libssh-debugsourceUpgrade libssh-config | Mar 16, 2026 | Feb 10, 2026 |
| Debian | — | Upgrade libssh | Aug 3, 2026 | Aug 3, 2026 |
| Oracle_linux | — | Upgrade libssh-configUpgrade libsshUpgrade libssh-devel | Oct 22, 2026 | Feb 10, 2026 |
| Redhat_linux | — | Upgrade libssh-configUpgrade libssh-debugsourceUpgrade libssh-debuginfoUpgrade libsshUpgrade libssh-develNo solution exists | May 20, 2026 | Feb 10, 2026 |
| Rocky_linux | — | Upgrade libssh-develUpgrade libssh-debuginfoUpgrade libssh-debugsourceUpgrade libssh | Jun 1, 2026 | May 28, 2026 |
| Suse | — | Upgrade libssh-devel-docUpgrade libssh4Upgrade libssh-develUpgrade libssh4-32bitUpgrade libssh-config | Mar 4, 2026 | Feb 17, 2026 |
| Ubuntu | — | Upgrade libssh-4Upgrade libssh-4 (Ubuntu Pro) | Feb 19, 2026 | Feb 13, 2026 |
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